Top-ranked recipe named "Blueberry Cream Cake"
Mix cake mix according to directions on box and bake in 3 or 4 layers.
While cake cools, mix Cool Whip, sugar, cream cheese and
confectioners' sugar together. After cake is completely
cooled, ice middle of cake with Cool Whip mixture and some
of the blueberry pie filling.
Repeat for next 2 or 3 layers.
Ice sides and top of cake, leaving icing a little higher
around the outside of the top layer. Place blueberry pie
filling on top.