Banana Cake

2/3 c. banana, mashed
1/2 c. butter, softened
3 lg. eggs
3/4 c. water
2 c. unbleached flour
2 tsp. baking powder
1 tsp. baking soda
1 tsp. cinnamon
Optional: 1 c. chopped walnuts OR 1/2 c. chopped walnuts & 1/2 c. raisins

Grease and flour a 9 x 13 inch pan. Beat together mashed banana and soft butter until creamy. Beat in water. In a separate bowl, beat eggs until very foamy. Beat into mixture. Blend in flour, baking powder, baking soda and cinnamon. Beat until smooth. Stir in walnuts or walnuts and raisins, if desired. Spread batter evenly in pan. Bake at 350 degrees for 20 minutes or until a knife inserted comes out clean. Cool. Serves 8-10.