Garlic Shrimp Gratin

Garlic Shrimp Gratin combines juicy shrimp with a creamy garlic sauce beneath a golden Parmesan, Gruyère, and breadcrumb topping. The sauce is rich without being overly heavy, while lemon and parsley brighten the buttery seafood and keep the gratin balanced.

This version bakes in a shallow 2-quart dish so the shrimp cook quickly and evenly. The sauce is prepared briefly on the stovetop, then the assembled gratin bakes just until bubbling and golden to help prevent the shrimp from becoming rubbery.

Why This Recipe Works

• A shallow baking dish keeps the shrimp in an even layer. This helps them cook at a similar rate instead of leaving some overdone and others undercooked.
• Garlic is softened in butter before the cream is added. Brief cooking mellows its raw bite and distributes the flavor throughout the sauce.
• A small amount of flour stabilizes the cream sauce. It gives the gratin enough body to coat the shrimp rather than leaving a thin pool of liquid.
• Parmesan, Gruyère, and panko create a crisp savory topping. The cheeses melt while the breadcrumbs brown, adding texture against the tender shrimp.
• Lemon is added after the sauce leaves the heat. This preserves its fresh flavor and reduces the chance of the cream separating.

Equipment Needed

• Shallow 2-quart baking dish, approximately 8 × 8 inches
• Large 12-inch skillet
• Small mixing bowl
• Whisk
• Rubber spatula or wooden spoon
• Fine grater or microplane
• Instant-read thermometer

Ingredients List

For the Shrimp and Garlic Cream Sauce

• 1¼ pounds (567 g) large raw shrimp, peeled and deveined, tails removed
• ¾ teaspoon (about 2.5 g) kosher salt, divided
• ¼ teaspoon (about 0.5 g) freshly ground black pepper
• 3 tablespoons (42 g) unsalted butter, divided
• 5 medium garlic cloves (about 15 g), finely minced
• 1 tablespoon (8 g) all-purpose flour
• ¾ cup (180 mL) heavy cream
• ½ cup (120 mL) low-sodium seafood stock or chicken broth
• 1 teaspoon (2 g) finely grated lemon zest
• 1 tablespoon (15 mL) fresh lemon juice
• 2 tablespoons (8 g) chopped fresh flat-leaf parsley, divided

For the Gratin Topping

• ½ cup (50 g) finely grated Parmesan cheese
• ½ cup (57 g) shredded Gruyère cheese
• ½ cup (30 g) panko breadcrumbs
• 1 tablespoon (14 g) unsalted butter, melted
• ¼ teaspoon (about 0.5 g) smoked paprika

Ingredient Notes and Substitutions

Shrimp

Large shrimp, around 21–30 count per pound, are substantial enough to remain juicy during baking. Medium shrimp can be used, but they will cook more quickly. Avoid using fully cooked shrimp because they can become tough during the second cooking.

Heavy Cream

Heavy cream creates the smooth base for the gratin sauce. Half-and-half can be substituted, but the sauce will be thinner and slightly less rich. Whole milk is not ideal unless the flour is increased slightly, which would change the texture.

Gruyère

Gruyère melts smoothly and adds a nutty flavor that works well with garlic and seafood. Swiss cheese can be substituted for a milder result, while mozzarella will melt well but provide less flavor.

Parmesan

Parmesan adds saltiness and helps the top brown. Pecorino Romano can be substituted, but it is sharper and saltier, so reduce the added salt slightly.

Panko Breadcrumbs

Panko creates a lighter, crunchier topping than standard fine breadcrumbs. Regular dry breadcrumbs can be used, but the crust will be finer and more compact.

Step-by-Step Instructions

1. Prepare the Oven and Baking Dish

Preheat the oven to 425°F (220°C).

Lightly grease a shallow 2-quart baking dish with 1 tablespoon (14 g) of the butter.

Pat the shrimp dry with paper towels.

Season them with ½ teaspoon of the kosher salt and all of the black pepper, then arrange them in a single layer in the prepared dish.

2. Cook the Garlic

Melt the remaining 2 tablespoons (28 g) butter in a large skillet over medium heat.

Add the minced garlic and cook for about 30–45 seconds, stirring constantly.

The garlic should smell fragrant but should not turn dark brown.

3. Make the Sauce Base

Sprinkle the flour over the garlic butter.

Whisk continuously for about 1 minute.

The mixture should look smooth and lightly foamy, without visible dry flour.

4. Add the Cream and Broth

Slowly whisk in the heavy cream, followed by the seafood stock or chicken broth.

Add the remaining ¼ teaspoon kosher salt.

Cook over medium heat for 3–4 minutes, whisking frequently, until the sauce lightly coats the back of a spoon.

It should be creamy but still pourable.

5. Add Lemon and Parsley

Remove the skillet from the heat.

Stir in the lemon zest, lemon juice, and 1 tablespoon (4 g) of the chopped parsley.

Taste the sauce. It should be creamy, garlicky, and lightly bright from the lemon.

6. Assemble the Gratin

Pour the warm garlic cream sauce evenly over the raw shrimp.

Use a spoon to make sure the sauce reaches between the shrimp rather than sitting only on top.

The shrimp should remain mostly in a single layer.

7. Make the Gratin Topping

In a small bowl, combine the Parmesan, Gruyère, panko breadcrumbs, melted butter, and smoked paprika.

Mix until the breadcrumbs are lightly coated and the cheeses are evenly distributed.

8. Top the Shrimp

Sprinkle the breadcrumb and cheese mixture evenly over the shrimp and sauce.

Do not press it down firmly; a loose layer browns more evenly and stays crisper.

9. Bake the Gratin

Bake at 425°F (220°C) for 10–12 minutes.

The sauce should bubble around the edges, the topping should turn golden, and the shrimp should become opaque and curl into loose C-shapes.

Check the thickest shrimp with an instant-read thermometer. It should reach 145°F (63°C).

If the topping needs more color but the shrimp are already cooked, broil for no more than 30–60 seconds while watching closely.

10. Rest Before Serving

Remove the gratin from the oven and let it rest for 5 minutes.

The sauce will thicken slightly as it stands.

11. Garnish and Serve

Sprinkle the remaining 1 tablespoon (4 g) chopped parsley over the top.

Serve warm, spooning some of the garlic cream sauce and crisp topping over each portion.

Tips for Success

• Dry the shrimp well. Excess surface moisture can thin the cream sauce and make the topping soggy.
• Keep the shrimp in one layer. Crowding them into a deep pile makes even cooking more difficult.
• Do not brown the garlic deeply. Burned garlic can make the entire cream sauce taste bitter.
• Bake only until the shrimp are cooked through. Shrimp turn rubbery quickly once they go much beyond 145°F (63°C).
• Use a shallow gratin dish. More surface area gives you a better ratio of crisp topping to creamy shrimp.
• Broil only if necessary. The cheese topping can brown quickly, so keep the gratin under close observation.

Storage, Freezing, and Make-Ahead Instructions

Refrigeration

Transfer leftover Garlic Shrimp Gratin to an airtight container and refrigerate within 2 hours of cooking.

Store for up to 2 days.

The breadcrumb topping will soften during refrigeration.

Freezing

Freezing the fully assembled gratin is not recommended. Cooked shrimp can become tougher after freezing and reheating, and cream-based sauces may separate.

Reheating

Reheat individual portions in a 325°F (165°C) oven for about 10–12 minutes, or until heated through to 165°F (74°C).

Cover loosely with foil if the topping begins browning before the center is hot.

Avoid prolonged reheating, which can make the shrimp tough.

Make-Ahead Preparation

The breadcrumb-cheese topping can be mixed up to 1 day ahead and refrigerated in an airtight container.

The shrimp can be peeled, deveined, and refrigerated up to 1 day ahead.

For the best texture and food safety, prepare the cream sauce and assemble the gratin shortly before baking rather than storing raw shrimp in the cream sauce overnight.

FAQ

Can I make Garlic Shrimp Gratin ahead of time?

You can prepare the shrimp and breadcrumb topping a day ahead, but the gratin is best assembled shortly before baking. This keeps the shrimp fresh and prevents the breadcrumb topping from becoming soggy.

Can I use frozen shrimp?

Yes. Thaw the shrimp completely in the refrigerator, drain them, and pat them very dry before seasoning. Excess water from thawed shrimp can dilute the sauce.

How do I know when the shrimp are done?

The shrimp should be opaque and curled into loose C-shapes. For a reliable food-safety check, the thickest shrimp should reach 145°F (63°C).

Can I make this without Gruyère?

Yes. Swiss cheese is the closest practical substitute. Mozzarella also works but produces a milder flavor and a stretchier topping.

Why is my gratin watery?

The shrimp may not have been dried thoroughly, or the cream sauce may not have thickened enough before baking. Pat the shrimp dry and simmer the sauce until it lightly coats the back of a spoon before assembling.