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Delicious cheesy seafood bake loaded with shrimp, crab, and melted cheese.

Cheesy Seafood Casserole

A comforting dish that blends seafood and creamy cheese, perfect for family gatherings or busy weeknights.
Prep Time 20 minutes
Cook Time 25 minutes
Total Time 45 minutes
Course Dinner, Main Course
Cuisine American
Servings 6 servings
Calories 350 kcal

Ingredients
  

Main Ingredients

  • 1 lb sea scallops or shrimp Showcasing their juicy and tender texture
  • 1.5 cups cooked crab meat or imitation crab Offering a sweet and flaky component
  • 1 can (10.5 oz) cream of mushroom soup Providing a creamy and umami-rich base
  • 1 cup shredded cheddar cheese Adding that unmistakable cheesy goodness
  • 0.5 cup sour cream Contributing a tangy richness
  • 0.25 cup mayonnaise Enhancing the creaminess of the dish
  • 0.5 tsp Old Bay seasoning Imparting a delightful aromatic spice
  • to taste Salt and pepper For seasoning enhancement
  • 1 tbsp butter For sautéing and flavor infusion
  • 0.25 cup chopped onion Bringing an aromatic bite
  • 0.5 cup sliced mushrooms Adding earthy depth
  • 1 cup cooked rice or mashed potatoes (optional) Serving as a comforting base
  • to taste Chopped parsley For a fresh, vibrant garnish

Instructions
 

Preparation

  • In a skillet, melt the butter over medium heat. Add the chopped onions and sliced mushrooms, sautéing until they are soft and fragrant.
  • In a large mixing bowl, combine the cream of mushroom soup, sour cream, mayonnaise, Old Bay seasoning, salt, and pepper. Stir until well combined and smooth.
  • Gently fold in the crab meat and the sautéed onions and mushrooms.
  • If using rice or mashed potatoes, spread them evenly into a baking dish. Pour the creamy seafood mixture over the top.
  • Generously sprinkle the shredded cheddar cheese over the seafood mixture. Place the dish in a preheated oven at 375°F and bake for 20–25 minutes, or until bubbling and golden brown.
  • Once done, allow the casserole to cool slightly. Top with freshly chopped parsley and serve warm.

Notes

To elevate your casserole, add lemon juice or zest, or more vegetables. Leftovers reheat wonderfully.
Keyword casserole, Cheesy Seafood Casserole, Comfort Food, family meal, Seafood