In saucepan melt margarine over medium heat. Stir in corn starch, salt and
pepper until smooth. Remove from heat; gradually stir in milk until smooth.
Bring to boil over medium heat, stirring constantly, and boil 1 minute; add
onion. Place remaining ingredients in greasd 2 quart casserole. Stir in
corn starch mixture. Bake in 350 oven 25 minutes or until heated. Makes 6
servings.