Shrimp and Mushroom Casserole

Per Paula Deen recipe...
"This recipe can be served as a main dish with a green salad and French bread or as a side dish with steak."

8 T (1 stick) of butter
1/4 cup flour
1 1/2 cups half & half
1 can cream of mushroom soup
1 (13 1/4 oz) can of sliced mushrooms, drained
1/2 cup grated Parmesan cheese
1 pound cooked shrimp, peeled, deveined, and coarsely chopped
garlic powder to taste
buttered bread crumbs for topping (I used a sleeve of Ritz crackers tossed with a little butter)

Preheat oven to 350. In a saucepan over medium heat, melt butter and stir in flour, then slowly blend in half & half, stirring constantly. Sauce with be thick. Do not brown. Add mushroom soup, sliced mushrooms, and Parmesan. Fold in shrimp. Add garlic powder to taste. Pour mixture into buttered casserole dish and top with bread crumbs. Bake for 25-30 minutes.