Note: Blueberries, blackberries or raspberries ... to a boil. Mix cornstarch in a small bowl ... directed on the box. Do not add oil! ... ice cream if desired.
Cover the bottom of baking ... the can of blueberry pie filling. Then sprinkle DRY the box of cake mix and dot with the butter ... center comes out clean.
Bake cake as directed in ... and sugars together. Mix in Cool Whip and about 1/4 can of blueberry pie filling. Frost between layers ... drip down the sides.