If you like bananas, you'll like this cake!
1 white cake mix
2-3 ripe bananas, mashed
6oz chocolate chips
Mix cake according to package directions, adding bananas and chips. Pour into a 9x13 pan (greased according to box directions). Sprinkle with streusel (see below), and bake at 325 for 30-45 minutes.
1/2 c flour
1/2 c sugar
1/2 c peanut butter
Mix these until crumbly, and spread over cake.