- 1 (18.25 ounce) package banana cake mix
- 3/4 teaspoon baking powder
- 3 medium bananas
- 3 eggs
- 1/2 cup water
- 1/3 cup vegetable oil
- 1 1/2 cups chopped walnuts
- CRUMB TOPPING:
- 1/2 cup sugar
- 1/2 cup all-purpose flour
- 1/4 cup butter
- Place first seven ingredients in a large mixing bowl. Beat on low speed just until combined, then on medium for 2 minutes. Pour into a greased and floured 10-in. tube pan or a 13-in. x 9-in. x 2-in. baking pan. In a small bowl, combine topping ingredients until crumbly; sprinkle evenly over batter. Bake at 350 degrees F for 45 minutes. Cool. Store well-wrapped in refrigerator.