01 -
Set your oven to 350°F (175°C) to ensure it’s ready for baking.
02 -
In a large mixing bowl, combine the shrimp, crabmeat, celery, onion, and minced garlic. Stir to mix evenly.
03 -
In a medium saucepan over medium heat, melt the butter. Stir in the flour and cook for 1-2 minutes until golden and bubbly. Gradually whisk in the milk, stirring continuously for 3-5 minutes until thickened. Remove from heat and stir in mayonnaise, cheddar cheese, salt, and pepper.
04 -
Add the seafood mixture to the creamy sauce, stirring until evenly coated. Spread in a greased 9x13-inch baking dish.
05 -
Sprinkle breadcrumbs evenly over the casserole.
06 -
Bake for 30 minutes, or until the top is bubbly and golden brown.
07 -
Let the casserole cool for a few minutes, then garnish with fresh parsley. Serve warm with a side salad or steamed vegetables.