Heat oven to 425^.
Mix 1/2 cup sugar and the cornstarch in 2-quart saucepan; stir in blueberries and water Heat to boiling, stirring constantly; boil and stir 1 minute. Pour into ungreased 1 1/2 quart casserole. Mix remaining ingredients until soft dough forms, Drop dough by 6 Tablespoonfuls onto hot blueberry mixture. Bake until golden brown, about 15 minutes.
Note: For a faster method:
21 oz. of your favorite fruit pie filling
Heat pie filling to boiling in a saucepan. Pour into casserole dish. Continue as directed.