Garlic Shrimp Gratin

Garlic Shrimp Gratin

If you love cozy, cheesy comfort food with a little “wow” factor, this Garlic Shrimp Gratin is going to be your new weeknight (and date night) hero—creamy garlic shrimp baked in a bubbly cheese gratin that goes from oven to table in under 40 minutes.

What Is Garlic Shrimp Gratin? (And Why I Can’t Stop Making It)

Garlic Shrimp Gratin is a creamy, oven baked shrimp gratin with a rich garlic butter sauce, a light cream base, and a golden, cheesy crust. Think French-style seafood gratin meets American comfort food casserole. It’s a close cousin of shrimp au gratin, but a little lighter and simpler, with ingredients you can grab at any regular grocery store.

I started making this baked garlic shrimp dish a few years ago when my kids were coming and going from college and I needed something that felt “special” but didn’t keep me stuck in the kitchen all night. This shrimp and cheese casserole checks all the boxes: it looks fancy in a baking dish, tastes like something from a cozy bistro, but it’s honestly very easy.

It’s also a surprisingly flexible seafood gratin recipe. Want it extra cheesy? Add more mozzarella on top. Watching carbs? Skip the breadcrumb topping and you’ve got a low carb shrimp gratin that’s still deeply satisfying. Cooking for someone who “doesn’t like seafood”? The garlic, butter, cream, and parmesan mellow the shrimp flavor in a way that wins over a lot of skeptics.

I love to serve this creamy garlic shrimp on cool evenings with a simple green salad and a glass of chilled white wine—nothing fussy, just warm, cheesy comfort food that makes the house smell incredible.

Why You’ll Love This Garlic Shrimp Gratin

• Fast enough for a weeknight: This easy shrimp gratin is ready in about 35–40 minutes, start to finish.
• Restaurant flavor, home-kitchen effort: Tastes like shrimp au gratin from a bistro, but uses basic pantry ingredients.
• Comfort food with flexibility: Make it rich and cheesy or slightly lighter—your choice.
• Low carb–friendly: Skip or reduce the breadcrumbs and you’ve got a low carb shrimp gratin that still feels indulgent.
• Family-friendly: Creamy sauce and melty cheese make this a kid-approved shrimp casserole (even for cautious eaters).
• Great for guests: Garlic seafood casserole in one big dish looks impressive and feels special for holidays or dinner parties.
• Make-ahead friendly: Assemble ahead, chill, then bake when you’re ready.
• Customizable: Works with different cheeses, a splash of wine, or even mixed seafood if you want to play.

Ingredients for Garlic Shrimp Gratin

Here’s what you’ll need to make this cheesy shrimp gratin. I’ll give you exact amounts and also share a few helpful notes and substitutions.

For the creamy garlic shrimp base

• 1 ½ pounds raw shrimp, peeled and deveined
  (Medium or large; 26–30 count per pound works well. Fresh or thawed frozen. Pat very dry so they don’t water down the sauce.)

• 2 tablespoons unsalted butter
  (You can use salted butter—just reduce the added salt slightly.)

• 1 tablespoon olive oil
  (Helps keep the butter from burning and adds a nice round flavor.)

• 4–5 large garlic cloves, minced
  (This is Garlic Shrimp Gratin—don’t be shy! Use fresh garlic, not the jarred kind, if you can.)

• ½ small yellow onion, very finely chopped
  (About ¼ cup. Adds sweetness and depth to the cream sauce.)

• ½ teaspoon kosher salt, plus more to taste

• ¼ teaspoon freshly ground black pepper

• ¼ teaspoon crushed red pepper flakes (optional)
  (For a gentle heat; skip if you’re cooking for very spice-sensitive folks.)

• ½ cup dry white wine
  (Like Sauvignon Blanc, Pinot Grigio, or even a dry Chardonnay. If you don’t cook with wine, you can use low-sodium chicken broth or seafood stock.)

• 1 cup heavy cream
  (For the most luxurious cream sauce shrimp bake. You can use half-and-half for a lighter version, but the sauce will be slightly thinner.)

• ½ cup whole milk
  (Balances out the cream so it’s rich but not too heavy; use 2% if that’s what you have.)

• 1 tablespoon Dijon mustard
  (Doesn’t make it “mustardy”—it just adds a gentle tang and depth.)

• ½ teaspoon smoked paprika or sweet paprika
  (Smoked adds a subtle smoky note; sweet paprika is more neutral but still warm.)

• ¼ cup grated Parmesan cheese (about 1 ounce)
  (Adds salty, nutty flavor to the cream sauce. Use real Parmigiano-Reggiano or a good domestic parmesan, not the shelf-stable shaker if you can help it.)

• 2 tablespoons chopped fresh parsley
  (Stir some into the sauce and save a bit for garnish.)

• Juice of ½ lemon (about 1 tablespoon)
  (Brightens up the creamy garlic shrimp and keeps it from feeling too heavy.)

For the gratin topping

• 1 cup shredded mozzarella cheese
  (This gives you that gorgeous stretchy, melty top in this mozzarella shrimp gratin.)

• ½ cup shredded Gruyère or Swiss cheese
  (Traditional in many seafood gratin recipes; it adds nuttiness and helps with browning.)

  No Gruyère? Use Monterey Jack or more mozzarella + a little extra parmesan.

• ¼ cup grated Parmesan cheese
  (For a sharp, salty punch on top.)

• ½ cup fresh breadcrumbs or panko
  (For a crispy top. If you’re doing a low carb shrimp gratin, you can skip this or replace with a sprinkle of crushed pork rinds or just extra cheese.)

• 1 tablespoon olive oil or melted butter
  (Tossed with the breadcrumbs so they toast up golden.)

• Pinch of salt and black pepper

Step-by-Step Directions: How To Make Garlic Shrimp Gratin

Think of this as three little mini-tasks: season shrimp, cook the creamy garlic sauce, then assemble and bake. Nothing fussy, I promise.

1. Preheat and prep your dish

Preheat your oven to 400°F (200°C).
Lightly grease a medium baking dish—an 8x10-inch or 9x9-inch dish works well—with a bit of butter or cooking spray. Set aside.

If your shrimp are wet from thawing, pat them very dry with paper towels. This makes a big difference for any oven baked shrimp gratin; less water means more flavor and a thicker sauce.

2. Season the shrimp

Place the shrimp in a bowl.
Add a small pinch of salt, a few grinds of black pepper, and about half of the minced garlic (maybe 1 clove’s worth). Toss gently to coat and set aside while you start the sauce. This quick seasoning helps the shrimp taste like something, not just little passengers in the cream.

3. Start the garlic butter base

In a large skillet, heat 2 tablespoons butter and 1 tablespoon olive oil over medium heat.
When the butter is melted and foamy—but not browned—add the finely chopped onion and cook for about 3–4 minutes, stirring, until softened and translucent.

Add the remaining minced garlic and cook 30–45 seconds, just until fragrant. You don’t want the garlic to brown; burnt garlic will make your creamy garlic shrimp taste bitter.

4. Deglaze with wine and season

Pour in the ½ cup dry white wine and scrape the bottom of the pan with a wooden spoon to release any browned bits. Let this simmer for 2–3 minutes; it should reduce slightly and lose the strong alcohol smell.

Season with ½ teaspoon kosher salt, ¼ teaspoon black pepper, and the ¼ teaspoon crushed red pepper flakes if using, plus the ½ teaspoon paprika. Stir to combine. You should have a fragrant, slightly thickened base.

5. Build the cream sauce

Reduce the heat to medium-low.
Slowly pour in the 1 cup heavy cream and ½ cup whole milk, stirring as you go. Add the 1 tablespoon Dijon mustard and ¼ cup grated Parmesan. Keep stirring until the parmesan melts and the sauce starts to gently bubble around the edges.

Simmer for 3–5 minutes, stirring occasionally, until the sauce thickens enough to lightly coat the back of a spoon. You’re aiming for a pourable but lush sauce—not too runny, not pudding-thick.

Taste and adjust seasoning. It should taste a little on the salty side because it’ll be spread over the shrimp and topped with cheese.

Stir in the 2 tablespoons chopped parsley and the lemon juice. Turn off the heat. The sauce for your garlic shrimp casserole is ready.

6. Arrange the shrimp in the baking dish

Spread the seasoned raw shrimp evenly in your prepared baking dish. They can be snug; they’ll shrink as they cook.

Give the cream sauce a quick stir and pour it over the shrimp, using a spatula to nudge the shrimp so they’re mostly submerged. This is what makes it a proper cream sauce shrimp bake instead of just shrimp with melted cheese thrown on top.

7. Mix the gratin topping

In a small bowl, combine:

• 1 cup shredded mozzarella
• ½ cup shredded Gruyère or Swiss
• ¼ cup grated Parmesan

Toss gently. In another bowl, mix the ½ cup breadcrumbs or panko with 1 tablespoon olive oil or melted butter, plus a pinch of salt and pepper, until lightly coated.

If you’d like a more “casserole-style” feel, you can mix all the cheeses with the breadcrumbs instead of layering—but I like the cheese directly on the sauce and the crumbs on top for contrast.

8. Top the shrimp and sauce

Sprinkle the shredded cheese mixture evenly over the creamy garlic shrimp.
Then scatter the prepared breadcrumbs on top in an even layer. Try not to pack them down; loose crumbs brown more nicely.

9. Bake until bubbly and golden

Place the dish on a rimmed baking sheet (just in case of bubbling) and bake at 400°F (200°C) for 15–18 minutes, or until:

• The sauce is bubbly around the edges
• The shrimp are opaque and just cooked through
• The top is lightly golden brown

If your shrimp are very large, they may need a minute or two more. Be careful not to overbake—rubbery shrimp are nobody’s friend.

10. Broil briefly for extra color (optional)

If you want more color on the top of your parmesan shrimp gratin, switch the oven to broil for 1–2 minutes. Watch it like a hawk; cheese goes from golden to “whoops” very fast.

11. Rest and garnish

Remove your Garlic Shrimp Gratin from the oven and let it rest for about 5 minutes. This helps the cream sauce settle slightly and makes serving easier.

Sprinkle with a little extra chopped parsley and, if you like, a tiny squeeze of fresh lemon right before bringing it to the table.

Servings & Timing

• Yield: Serves 4 as a main dish, 6 as a side or appetizer
• Prep Time: 15–20 minutes
• Cook Time: 15–18 minutes
• Rest Time: 5 minutes
• Total Time: About 35–40 minutes

For a weeknight shrimp dinner, that timing is hard to beat—especially for something that feels this cozy and “company-worthy.”

Variations: Make This Garlic Shrimp Gratin Your Own

You know what? This recipe is ridiculously adaptable. Here are some fun twists:

• Low Carb Shrimp Gratin: Skip the breadcrumbs and use just cheese on top, or sprinkle crushed pork rinds for crunch.
• Mixed Seafood Gratin: Use a mix of shrimp, scallops, and small chunks of firm white fish (like cod); just keep the total weight around 1 ½ pounds.
• Bacon or Pancetta Version: Sauté 3–4 strips of chopped bacon or pancetta first, then cook the onions in some of the rendered fat for a smoky garlic seafood casserole.
• Spicy Garlic Shrimp Bake: Double the crushed red pepper flakes and add a pinch of cayenne for a spicier kick.
• Gluten-Free Shrimp Gratin: Use gluten-free panko or skip the crumbs and load up on cheese.
• Lighter Cream Sauce: Swap half the cream for more milk and whisk in 1 teaspoon cornstarch to help the sauce thicken without feeling too heavy.

Serving Ideas: What Goes With Garlic Shrimp Gratin?

Because this baked shrimp with cheese is rich and creamy, I like to keep the sides simple:

• A crisp green salad with lemon vinaigrette
• Steamed or roasted broccoli, asparagus, or green beans
• Buttered noodles or orzo
• Crusty bread or a baguette (for scooping up that garlic cream—highly recommended)
• Cauliflower rice or zucchini noodles for a lower-carb plate

If you’re serving this for guests, a small starter like a simple tomato salad or roasted mushrooms makes a nice lead-in without overshadowing the shrimp gratin.

Storage & Reheating Tips

Seafood can be a little fussy, but this garlic butter shrimp bake holds up better than you might think.

Storing

• Fridge: Let the gratin cool to room temperature, then cover tightly or transfer to an airtight container. Store in the refrigerator for up to 2 days.
• Freezer: I don’t recommend freezing the finished dish; the cream sauce can separate and the shrimp texture can get a bit mealy. If you must freeze, do so only with leftovers and expect some texture change.

Reheating

• Oven (best): Place leftovers in a small baking dish, cover with foil, and warm at 325°F (165°C) for about 12–15 minutes, until heated through. Uncover for the last few minutes if you want to re-crisp the top.
• Microwave (quick): Reheat on medium power in short bursts, about 30–45 seconds at a time, stirring gently between bursts. This helps avoid overcooking the shrimp.

Try not to reheat more than once. Shrimp get tougher each time they’re reheated, and the sauce can break.

Make-Ahead Advice

You can assemble this shrimp and cheese casserole in advance:

• Prepare the sauce and assemble the dish with raw, seasoned shrimp, sauce, and cheese.
• Hold off on adding the breadcrumb topping until just before baking so it stays crisp.
• Cover tightly and refrigerate for up to 12 hours.
• When ready to bake, take it out of the fridge while the oven preheats, add the breadcrumb mixture, and bake. You may need to add 3–5 minutes to the baking time since it’s starting cold.

Notes from My Kitchen (Little Things That Make a Big Difference)

• Dry your shrimp well. This seems minor, but damp shrimp release more liquid, which can water down your cream sauce and make your garlic shrimp gratin a bit soupy.
• Watch the garlic like a hawk. Garlic should be fragrant and just turning golden at the edges. If it browns too much, it turns bitter—and in a garlic-forward dish, you’ll really notice.
• Choose your cheese wisely. Pre-shredded cheese is convenient, but it’s often coated with anti-caking agents that keep it from melting smoothly. If you have the energy, shred a block of mozzarella and Gruyère yourself. It melts silkier.
• Season in layers. Taste the sauce before it goes over the shrimp. Shrimp are mild, and cheese and cream can dull flavors, so the sauce should be a tiny bit saltier than you’d eat on its own.
• Don’t overbake. Shrimp cook fast—usually 6–8 minutes at 400°F. Because they’re nestled in sauce and under cheese, they cook a hair slower, but once they’re opaque and pink, you’re done.
• Let it sit before serving. Those 5 minutes of resting time let the cream sauce tighten slightly so it doesn’t run all over the plate, and it also saves any eager tongues from getting burned.

On my third test batch, I realized I’d been underestimating how quickly the top browns in my oven. So now I place the dish on the middle rack (not too close to the top), and that seems to give me the perfect creamy center and golden top.

FAQs About Garlic Shrimp Gratin

1. Can I use frozen shrimp?
Yes—frozen shrimp are great. Thaw them completely in the fridge or under cold running water, then pat very dry before seasoning.

2. Can I make this with cooked shrimp?
You can, but it’s not my first choice. If using cooked shrimp, reduce the baking time and add them to the dish after the sauce has cooled a bit, baking just until warmed through to avoid rubbery shrimp.

3. How do I know when the shrimp are done?
They’ll be opaque, pink, and slightly curled into a “C” shape. If they’re tightly curled into an “O,” they’re likely overcooked.

4. Can I leave out the wine?
Absolutely. Replace the wine with low-sodium chicken broth or seafood stock. The flavor will be a bit different but still delicious.

5. Is this Garlic Shrimp Gratin gluten-free?
As written, no, because of the breadcrumbs. But if you use gluten-free panko or skip the crumbs, this becomes a gluten-free-friendly garlic cream shrimp casserole.

6. What’s the best cheese combo for shrimp au gratin flavor?
A mix of mozzarella for melt, Gruyère or Swiss for nuttiness, and parmesan for sharpness gives you the classic seafood gratin vibe.

7. Can I double the recipe for a crowd?
Yes, easily. Use a larger baking dish (like a 9x13) and keep an eye on the baking time; it may need a few extra minutes, but don’t let the shrimp overcook.

8. Can I lighten this up?
You can use half-and-half instead of heavy cream and add a teaspoon of cornstarch to help thicken, and use a bit less cheese on top—but remember, this is comfort food, so some richness is part of its charm.

Wrapping It Up: A Cozy Pan of Comfort

Garlic Shrimp Gratin is one of those comfort food shrimp bakes that manages to feel both special and very doable on a regular weeknight—creamy garlic shrimp, a silky sauce, and a golden cheesy top that makes everyone at the table a little quieter for the first few bites.

If you try this oven baked shrimp gratin, I’d love to hear how it turned out for you—did you go low carb, add extra spice, or sneak in some scallops? Leave a comment with your tweaks, and if you enjoy recipes like this, take a peek at my other easy shrimp dinners and cozy casseroles next time you’re planning the week’s meals.