1-Getting this Crab Shrimp Casserole ready: Begin by preheating your oven to 350°F and lightly greasing a 9×13-inch baking dish to avoid any sticking surprises.

2-First: in a large bowl, combine the 1 lb shrimp, 1 lb crabmeat, 1 cup diced celery, ½ cup diced onion, and 2 cloves minced garlic until everything is evenly mixed. This sets the base for that seafood goodness. Next, in a saucepan, melt 2 tablespoons butter over medium heat, then whisk in 2 tablespoons all-purpose flour and cook for 1-2 minutes until it turns golden, creating a simple roux that thickens your sauce.

3-Gradually add 1 cup whole milk or 2% milk, whisking constantly until the sauce thickens in about 3-5 minutes. Remove from heat and stir in ½ cup mayonnaise or Greek yogurt and 1 cup grated sharp cheddar cheese, seasoning with salt and pepper to taste.

4-Pour the sauce over the seafood mixture and fold it in gently to keep the textures intact. Transfer everything to your prepared baking dish, smooth the top, and sprinkle ½ cup panko breadcrumbs evenly over it for that irresistible crunch. Bake for 30 minutes until bubbly and golden brown, then let it rest for 5 minutes before garnishing with 1 tablespoon chopped fresh parsley. Serve warm with garlic bread or a green salad, and you’re all set for a meal that takes about 15 minutes to prep and 30 minutes to bake, totaling 45 minutes.