Mix together all dry ingredients in a large mixing bowl. Add pureed banana and blueberry to dry mixture. Blend in margerine until combined. Add eggs and mix until well blended. Avoid mixing too much at this point as the texture will be affected.
Place batter in a greased loaf pan and bake at 350°F for 50 minutes. Check bread with a toothpick in the center of the loaf to make sure it is completely baked. Makes 10 servings.