Mix:  2/3 c butter, 1 1/3 c sugar, 1/2 tsp grated lemon rind (orange works okay, too)
Add:  2 beaten eggs
Mash:  2 c banana (4-5)

Alternate the banana into the initial mixture with a combination of:
3 1/2 c flour, 1/2 tsp soda, 3 tsp baking powder.

Bake for 60-70 minutes in a 350 degree oven in 2 greased loaf pans.