1-3/4 cups sifted flour
2 teaspoons baking powder
1/4 teaspoon baking soda
1/2 teaspoon salt
1/3 cup butter or margarine
2/3 cup sugar
2 eggs
1 cup bananas, mashed
1 cup blueberries
Sift together flour, baking powder, soda, and salt. Set aside. Cream butter and gradually beat in sugar until light and fluffy.
Beat in eggs one at a time. Add flour mixture and banana alternately in three parts. Gently stir in blueberries. Turn into oiled 9 x 5-inch loaf pan. Bake at 350 degrees for 50 minutes. Turn out of pan to cool.