Combine cornstarch and 1 tablespoon sugar. Stir into blueberries and heat slowly over low heat for 5 minutes or until thick. Pour fruit into a 1-quart baking dish. Cut in margarine with a fork until mixture looks like very small pebbles. Stir together egg white and milk and add to flour mixture, stirring until a soft, slightly lumpy dough is formed.
Drop spoonfuls of dough over the blueberries.
Bake for 20 minutes or until dough is lightly browned and crusty when tapped. Best served warm. Also good with ice cream, frozen yogurt or a dollop of whip cream. This information is not intended to be a substitute for professional medical advice. You should not use this information to diagnose or treat a health problem or disease without consulting with a qualified healthcare provider.