Berry Cake

1 package of cake mix, either chocolate, yellow, or white

1 cup sour cream
2/3 cup icing sugar
3 cups Cool Whip prepared topping mix
(or use Dream Whip, prepared)
1 cup sliced strawberries
1/2 cup blueberries

Prepare cake mix in two 9 inch cake pans, 
following the package directions.
Bake as directed, cool.

Remove cakes from pans.
Allow to cool completely.

Beat sour cream and icing sugar in a large bowl
until well blended.
Add the Cool Whip and mix well.
Set aside.

Cut each cake in half horizontally to make 4 layers 
in total.
Place the first round on a large plate.
Spread with about a 1/2 cup of  Cool Whip mixture.
Top with about 1/2 cup of the berry mixture and an 
additional 1/2 cup of Cool Whip mixture.

Repeat with the next 2 layers.  Top cake with the 
remaining Cool Whip mixture.

Refridgerate until ready to serve.
Store leftovers in the fridge.