Remove bratwurst from casing and brown draining fat.
Preheat oven to 350 degrees with oven rack placed in the center of the oven.
Defrost potatoes. Combine in large mixing bowl with 1/2 cup melted butter, and seasoning.Add onion, soup, sour cream, cheese, garlic & spices and bratwurst. Blend thoroughly. Pour into buttered casserole. Cover with crumbs. Bake 45 minutes.