Preheat oven to 325°. Cream together bananas, butter or margarine, and sugar. Add eggs and mix. Add remaining ingredients and mix well. Pour into a greased 9x5x3-inch loaf pan. Bake 45-55 minutes until golden brown or a toothpick inserted in the center comes out clean.
Note: To make 12 muffins, pour mixture into muffin tins and bake 15 to 20 minutes.