1 c. mayonnaise
1 c. sugar
1 tsp. vanilla
2 or 3 mashed bananas
2 c. flour
2 tsp. baking powder
1/2 c. water

Mix all in bowl until well blended. Do not overbeat. Grease pan. Bake at 350 degrees in 9 x 9 inch pan for 30 minutes. Test with toothpick. Frost with your favorite frosting.