In saucepan, cook onion, garlic, and mushrooms in margarine. In bowl, toss cut up cheese pieces with flour. Add onion mixture and remaining ingredients. Mix c arefully. Pour into lightly greased 9 inch pie plate. Bake in preheated 350 deg ree oven for 45 minutes or until set. Refrigerate leftovers. Recipe from "One M illion Recipes CD" busted by Judy R.