Date Coffee Cake

1/3 cup mashed banana
1/2 cup butter, softened
3 large eggs
1 teaspoon vanilla extract
1 1/4 cups water
3 cups unbleached white flour
1 teaspoon baking soda
2 teaspoons baking powder
1 1/2 cups chopped dates

Beat together mashed banana and cutter until creamy. Add eggs, vanilla extract and water; beat. Measure in flour, baking soda and baking powder, and beat well. Stir in chopped dates. Spoon batter into a greased and floured 13 x 9-inch baking pan. Spread batter evenly in pan.

Combine Topping ingredients and sprinkle over batter. Bake at 350 degrees F for 20 to 25 minutes or until a knife inserted comes out clean. Cool on a wire rack.

Topping
1/3 cup chopped dates
1/3 cup chopped walnuts
1/3 cup flaked coconut