The secret to making excellent banana nut bread is the banana peeling should be almost black so the bananas will be mushy and over ripe.
1 3/4 cups flour (bread flour is best) 2/3 cup sugar 2 teaspoons baking powder 1/2 teaspoon baking soda 1/2 teaspoon salt 1 cup mashed ripe (this is usually 2 or 3 bananas) 1/3 cup margarine 2 tablespoons milk 2 eggs 1 cup chopped walnuts (divided into 2 (1/2 cup) portions
Preheat the oven to 350 degrees. In a medium size bowl combine all dry ingredients (flour, baking powder, baking soda, and salt), stir together to combine. In another medium size bowl combine margarine and sugar, with a mixer cream the margarine, and sugar together until light and fluffy. Add in mashed bananas, eggs, milk and mix well. Add 1/2 of the dry ingredients into the wet ingredients, mix until the flour is just mixed in, then add in the remaining flour and 1/2 cup walnuts, blend together until everything is mixed together. Do not overstir.
Pour batter into a greased 8x4 inch loaf pan. Then top the batter with the remaining chopped walnuts. Bake at 350 degrees for 55 to 60 minutes or until a toothpick inserted near the center comes out clean. Cool for 10 minutes on a wire rack.
While Starbucks does not make their banana bread with butter, I think this comes out more rich this way. I also like to add in a sprinkle or two of cinnamon and sugar into this, again, not in their recipe, it does add that little something extra.