1. Preheat oven to 350F. Grease a 9 inch loaf pan, set aside.
2. In a large bowl, sift together flour, baking powder, salt and baking soda; set aside.
3. In medium bowl cream butter and gradually beat in sugar until light and fluffy. Beat in eggs one at a time
4. Add flour mixture to butter mixture alternately with the banana. Mix until moistened, do not overmix as the bread will be tough. Gently stir in blueberries
5. Pour into loaf pan and bake for 45-50 minutes or until a tester inserted in the center comes out clean. Turn out of the pan and cool on a wire rack.
Makes one 9 inch loaf pan of bread