Boil the macaroni for 4 minutes or until half-cooked (salt the water!)
In a medium saucepan heat the half-and-half with cayenne, salt and pepper. Add macaroni and 1 1/2 cups of the cheese and cook on medium heat until the cheese melts. Pour into a buttered casserole and top with remaining cheese.
Bake in a preheated 350F oven for 15 minutes until the cheese melts.