1 box yellow cake mix
1/4 tsp. baking powder
1/2 c. chopped nuts
1 1/2 c. mashed bananas (3 med.)
3 eggs
1/2 c. water
1/3 c. vegetable oil

Mix together and pour into greased 9 x 13 inch pan. Combine:

1 c. sugar
1 c. flour
1 stick butter, softened

Mix with fork until crumbly and sprinkle over cake batter. Bake at 350 degrees for 40 to 45 minutes.