1/2 c. butter
3/4 c. brown sugar
1 lg. egg white
1 c. unsifted whole wheat flour
1/2 c. unsifted white flour
1 tsp. baking soda
1 1/4 c. mashed ripe bananas (2 lg. or 3 sm.)
1/4 c. yogurt

Cream the butter and sugar together until light and creamy. Beat in egg. Sift together the whole wheat flour, white flour, baking soda, and combine the bananas and yogurt, stirring just enough to mix. Add dry ingredients alternately with banana mixture to other mixture, stirring enough to combine well. Turn into greased 9 x 5 inch loaf pan. Bake 50-60 minutes at 350 degrees. Cool in pan 10 minutes. Remove and finish cooling on a rack.