Few dishes deliver comfort and elegance quite like a perfectly baked fish casserole. This recipe combines tender flaky fish, a rich creamy sauce, and a golden, buttery topping for a meal that’s both hearty and sophisticated.
Whether you’re feeding a family, impressing guests, or just craving cozy seafood goodness, this casserole is a guaranteed crowd-pleaser. Let’s dive in!
Why You’ll Love This Fish Casserole
✅ Restaurant-quality flavor – Luxuriously creamy with a crispy topping
✅ Easy to customize – Use your favorite fish or add veggies
✅ Meal-prep friendly – Assemble ahead and bake when ready
✅ Perfect for any occasion – Fancy enough for dinner parties, simple enough for weeknights
Ingredients You’ll Need
For the Casserole Base:
1.5 lbs white fish fillets (cod, haddock, tilapia, or halibut work great)
1 tbsp lemon juice (plus extra lemon slices for garnish)
1 tsp Old Bay seasoning (or paprika + garlic powder)
Salt & pepper to taste
For the Creamy Sauce:
3 tbsp butter
3 tbsp flour
1.5 cups milk (whole milk or half-and-half for extra richness)
½ cup fish or vegetable broth
1 tsp Dijon mustard
½ cup shredded Parmesan
¼ cup fresh parsley, chopped
For the Crunchy Topping:
1 cup Panko breadcrumbs
¼ cup grated Parmesan
2 tbsp melted butter
1 tsp garlic powder