1/2 c. softened butter
1 c. sugar
2 eggs
1 1/2 c. flour
2 tbsp. cocoa
1 tsp. baking soda
1 tsp. salt
1/2 tsp. cinnamon
1 tsp. vanilla
1 c. mashed banana
1/2 c. sour cream
1/2 c. chopped walnuts
1-2 c. chocolate chips (opt.)

Cream butter, add sugar. Beat until fluffy. Add eggs, one at a time. Add the sift dry ingredients. Mix in vanilla, banana and sour cream. Stir in walnuts and chocolate chips. Grease pan. Bake 55 minutes at 350 degrees. Cool 10 minutes. Remove from pan.