1 box yellow cake mix
4 to 5 ripe bananas
1 lg. box vanilla instant pudding
1 (8 oz.) container Cool Whip

Make 2 layer cake as directed on box. Let cool. Prepare pudding as directed on box. Fold in container of Cool Whip. Slice bananas on first layer and top with some of the pudding mixture. Put second layer on top. Repeat bananas and add the rest of pudding mixture on top and sides; chill. Keep cool.