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

Mix ingredients. Pour into 9"x13" greased pan. Combine: 1 c. flour 1 stick butter, softened

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