Wayne's Favorite Banana Cake

1/2 C. butter
1 C. sugar
2 eggs
2 bananas 
1/4 C. sour cream
1 tsp. baking soda
1 tsp. baking powder
1/2 tsp. salt
1 1/4 C. flour
powered sugar
1/2 C. chopped nuts or chocolate chips (optional)

Cream butter and sugar.  Add 2 eggs, one at a time.  Mash bananas with sour cream and baking soda, add to egg mixture.  Combine and stir in baking powder, salt and flour.  Bake at 350* for 45 minutes in an 8x8 greased and floured pan.  Sprinkle with powdered sugar.