1/2 c. butter, melted
1 1/2 c. sugar
2 eggs
1 tsp. vanilla
2/3 c. mashed banana
2 c. flour
1 tsp. baking powder
1/2 tsp. baking soda
1 tsp. salt
1 tsp. cinnamon
1/2 c. milk
1 1/2 c. chopped nuts (optional)

Cream butter, sugar and eggs together. Stir in vanilla and banana. Sift dry ingredients together and add alternately with milk to mixture. (Add nuts.) Spread into a greased and floured 10 x 15 pan. Bake at 350 degrees for 20 to 25 minutes.

Frost while still warm with:

2 c. powdered sugar
3 tbsp. butter, melted
2 tbsp. hot water
1 tsp. vanilla

Cool and cut into bars or squares.