Name: Shrimp Casserole
Prep time: 10 min
Cook time: 30 min
Total time: 40 min
Cuisine: American
Ingredients: 2 pounds large shrimp (21-24 count), peeled and deveined; 1 tablespoon Old Bay Seasoning; 1 tablespoon salt; 2/3 cup mayonnaise; 1/2 teaspoon garlic powder; 1/2 teaspoon ground black pepper; 4 ounces shredded mozzarella cheese; 4 ounces shredded medium cheddar cheese; 1 tablespoon butter, plus extra for greasing the pan; 1/2 cup panko breadcrumbs

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When my friend brought this shrimp casserole to a family dinner party, I watched it disappear before any other dish on the table. The combination of tender shrimp swimming in a creamy, cheesy sauce under a golden, crunchy breadcrumb topping had everyone coming back for seconds. This is one of those recipes that looks impressive but comes together in about 30 minutes, making it perfect for both special occasions and busy weeknights when you want something that feels a bit luxurious.

Why you’ll love this shrimp casserole

This recipe delivers restaurant-quality results without the fuss. The shrimp stay perfectly tender while the cheese creates a rich, satisfying sauce that clings to every bite. What really sets this apart is the buttery panko topping that adds essential crunch and keeps the dish from feeling heavy. It’s beginner-friendly enough for your first seafood attempt but impressive enough to serve at holiday gatherings. Best of all, it’s ready in 30 minutes and travels well to potlucks since it tastes delicious warm or at room temperature.

“I just made this and it was absolutely delicious! I added broccoli and mushrooms, sprinkled extra garlic on it, served it over quinoa and it was gone in no time!” — Lynne

How this shrimp casserole comes together

The beauty of this recipe lies in its simplicity. You’ll start by quickly boiling the shrimp in seasoned water for just 30 seconds—this brief cooking time is crucial for keeping them tender. After draining and cooling, the shrimp get tossed with a creamy mayo-based mixture, two types of cheese, and seasonings. Everything goes into a buttered baking dish, gets crowned with butter-coated breadcrumbs, then bakes until bubbly and golden. The whole process flows smoothly from start to finish with minimal cleanup.

What you’ll need

For the shrimp:

2 pounds large shrimp (21-24 count), peeled and deveined—frozen works perfectly if thawed properly
1 tablespoon Old Bay Seasoning for the cooking water
1 tablespoon salt for the cooking water

For the creamy filling:

2/3 cup mayonnaise—this creates the rich, binding sauce
1/2 teaspoon garlic powder
1/2 teaspoon ground black pepper
4 ounces shredded mozzarella cheese
4 ounces shredded medium cheddar cheese

For the topping:

1 tablespoon butter, plus extra for greasing the pan
1/2 cup panko breadcrumbs—panko gives the best crispy texture

Step-by-step instructions

Prepare your workspace: Preheat your oven to 375°F. Generously butter a 2 1/2 quart casserole dish, a 10-inch deep oven-safe skillet, or a 9×9 inch baking dish.

Cook the shrimp: Fill a large pot about three-quarters full with water and bring to a rolling boil. Add the salt and Old Bay Seasoning to the water. Add your shrimp and cook for just 30 seconds until they turn opaque. Immediately remove them with a strainer into a large mixing bowl. Let them cool for a few minutes, then drain any water that has collected or blot it up with paper towels—keeping the shrimp dry is important for the right consistency.

Create the filling: Add the mayonnaise, garlic powder, and black pepper to the cooled shrimp. Stir until every piece is coated. Sprinkle both cheeses over the shrimp and stir again until everything is well combined. Transfer this mixture to your prepared baking dish and spread it evenly.

Make the topping: In a small bowl or measuring cup, melt the remaining tablespoon of butter. Stir in the panko breadcrumbs until they’re evenly moistened and coated with butter. Sprinkle this mixture evenly over the shrimp.

Bake and broil: Place the casserole uncovered in your preheated oven for 13-15 minutes, or until the center reaches 145°F on an instant-read thermometer. Switch to broil and cook for 1-2 minutes more until the breadcrumbs turn golden brown. Let the casserole rest for 15 minutes before serving to allow the filling to set properly.

How to serve shrimp casserole

This dish shines as a main course served over rice, quinoa, or creamy mashed potatoes to soak up the delicious sauce. For a complete meal, pair it with roasted vegetables like carrots or Brussels sprouts, or keep it light with a crisp Caesar salad or fresh tomato cucumber mozzarella salad. Crusty bread like sourdough or focaccia is perfect for scooping up every last bit. The casserole works beautifully at room temperature, making it ideal for buffet-style serving at parties.

Storage and reheating tips

Refrigerate leftovers in a covered container for 2-3 days. The casserole reheats beautifully in a 350°F oven for about 10 minutes or in an air fryer until warmed through. If you’re making it ahead, you can assemble the shrimp filling and refrigerate it for up to 24 hours before baking—just wait to add the breadcrumb topping until you’re ready to bake so it stays crisp. Freezing is not recommended as shrimp can become rubbery when frozen and reheated in a creamy sauce.

Pro tips for success

Don’t overcook the shrimp: The 30-second boil time might seem brief, but shrimp cook incredibly fast. They’ll finish cooking in the oven, so you want them barely opaque when they come out of the pot. Overcooked shrimp turn rubbery and tough.

Manage moisture carefully: Some shrimp release extra liquid during baking, especially if they were previously frozen. If you notice pooling liquid after baking, simply blot it up with a paper towel before serving.

Get the breadcrumbs golden: Watch closely during broiling—the difference between perfectly golden and burnt happens in seconds. Keep the oven door slightly ajar and watch continuously during this final step.

Thaw frozen shrimp properly: Follow package instructions, usually overnight in the refrigerator. Avoid using hot water, which can affect texture and cause excess moisture.

Creative variations to try

Add vegetables: Stir in chopped broccoli florets, sliced mushrooms, or diced bell peppers to the shrimp mixture for added nutrition and color. Sauté them first to remove excess moisture.

Switch up the cheese: Try Gruyère for a more sophisticated flavor, pepper jack for heat, or Parmesan for a sharper bite. A combination of Parmesan and mozzarella creates an excellent flavor profile.

Make it spicy: Add a pinch of cayenne pepper to the mayo mixture or use Cajun seasoning instead of Old Bay for a Louisiana-style twist.

Try different seafood: Substitute half the shrimp with lump crab meat or add bay scallops for a mixed seafood casserole. Adjust cooking times as needed.

Change the topping: Mix grated Parmesan cheese into the breadcrumbs, or use crushed Ritz crackers for an extra buttery, rich topping.

Common questions answered

Can I use pre-cooked shrimp? While you can, fresh or raw frozen shrimp work better for this recipe. Pre-cooked shrimp are already at their doneness limit and can easily become rubbery when baked again. If you must use pre-cooked, skip the boiling step entirely and reduce the baking time to just 8-10 minutes.

Why is there liquid in my casserole after baking? Some shrimp naturally release water during cooking, especially if they were improperly thawed or overcooked during the boiling step. This doesn’t ruin the dish—just use a paper towel to blot up the excess liquid before serving.

Can I make this dairy-free? Yes, substitute the mayonnaise with a vegan version, use dairy-free cheese alternatives, and replace the butter with olive oil or vegan butter. The texture will be slightly different but still delicious.

What size shrimp works best? Large shrimp (21-24 count per pound) are ideal because they stay juicy and provide satisfying bites. You can use jumbo shrimp for a more luxurious presentation, or medium shrimp if that’s what you have—just adjust the boiling time by 5-10 seconds accordingly.

How do I know when the casserole is done? The center should reach 145°F on an instant-read thermometer, the cheese should be melted and bubbly, and the breadcrumbs should be golden brown. If the breadcrumbs are browning too quickly, tent the dish with foil and continue baking.