1 1/4 c. all-purpose flour
1/2 c. whole wheat flour
1 tsp. baking soda
1/4 tsp. salt
1/2 c. sugar
1/4 c. Puritan oil
1 egg
1 c. ripe banana, mashed
1 tsp. vanilla extract
Vegetable cooking spray

Combine first 4 ingredients in a small bowl. Stir well and set aside. Combine sugar and Puritan oil in a medium mixing bowl, beat at medium speed for 2 minutes or until well blended. Add egg and beat until light and lemon colored. With mixer running at low speed, add flour mixture, alternately with banana, beginning and ending with flour. Blend well. Stir in vanilla. Pour batter into 8 x 4 x 2 inch loaf pan coated with cooking spray. Bake at 350 degrees for 45 minutes or until wooden pick comes out clean. Cool 15 minutes in pan. Remove from pan and let cool completely.