1Spread pie filling in ungreased 1 1/2-quart casserole. Place in cold oven. Heat oven to 400ºF; let heat 10 minutes. Remove pan from oven.
2While pie filling is heating, stir remaining ingredients until soft dough forms. Drop by 6 spoonfuls onto warm pie filling. Sprinkle with additional sugar if desired.
3Bake 18 to 20 minutes or until topping is light brown.