1/2cupsfresh or frozen raspberries, thawed and drained
1/2cupscups fresh or frozen blueberries
8cups whipped topping
30gAdditional berries, optional
Instructions
With a serrated knife, slice off the top 1/2 in. of the cake; set aside. Cut a tunnel about 2 in. deep in the cake, leaving a 3/4-in. shell. Remove cake from tunnel; cut into 1-in. cubes.
Combine cake cubes, berries and half of the whipped topping; spoon into tunnel. Replace cake top.
Frost with remaining whipped topping. Garnish with berries if desired. Refrigerate until serving.