Preheat oven to 375 degrees. Cook and drain macaroni. Pan fry sausage. Remove and drain. In a 2 quart casserole dish, alternate layers of cheeses, macaroni and sausage, ending with sausage on top.
Prepare Sauce: Melt butter, blend in flour, stir in milk and seasonings. Bring to boil, stirring. Boil one minute. Pour sauce over casserole mixture. Bake 15 minutes. Serves 6 to 8.