Preheat oven to 350 degrees and grease and flour 9-inch round pan.
Prepare brownie mix as directed on package and stir in 1/2 cup sour cream. Pour into greased pan.
Bake 45 min. or until toothpick inserted in center comes out with fudgy crumbs. Do not over bake. Cool 10 min. Remove from pan and cool completely on a wire rack.
Mix remaining sour cream, Cool Whip, sugar and vanilla until blended. Cut brownie horizontally in half. Place bottom layer on plate and frost with half the sour cream mixture. Place the next layer and top with remaining sour cream mixture and fruit. Enjoy!
If you can't find Cool Whip at the store, you can make your own homemade cool whip. This recipe makes the came amount as 1 tub (about 3 cups).