Seafood Mac and Cheese

I think this is the 3rd mac and cheese recipe I've posted so far. I've always wanted to have lobster mac and cheese and hopefully someday I will. Until that time I will just have to settle for crab and shrimp.

Serves 8

1 pound pasta cooked and drained
6oz of cooked crab meat
6 oz of cooked bay shrimp-the little guys
4 cups of shredded gruyere or swiss cheese
3 cups of milk
4 tablespoons butter or margarine
1/2 cup flour
1/8 teaspoon of nutmeg
salt and pepper
1 onion, diced
2 cloves garlic, minced
1 cup panko bread crumbs
1/2 teaspoon old bay seasoning

Preheat oven to 400. Spray a large casserole with cooking spray. In a large sauce pot, melt the butter. Add the onion and garlic. Cook over medium/high heat until the onion is translucent. Add the flour and cook stirring continuously until the flour has had a chance to cook, about 1 minute. Add the milk, whisking until the mixture is smooth. Cook over medium heat until the mixture has thickened. Add the salt, pepper and nutmeg. Stir to combine. Turn off the heat and add the cheese. Stir until the cheese has melted and is mixed in. Add the cooked pasta, crab and shrimp to the pot and stir until combined. Pour the mixture into the casserole. Melt 3 tablespoons of butter. Add the panko and old bay seasoning. Stir well. Sprinkle the crumbs over the mac and cheese. Put in the oven and immediately reduce the heat to 350. Bake until the casserole is hot and bubbly and the panko on top has browned.