Cream butter, add sugars a little bit at a time. Bet in eggs 1 at a time. Add vanilla, bananas and sour cream. Mix well. Sift in the baking powder and baking soda, salt, and flour. Add chocolate chips. Por into greased and floured loaf pan. Makes 2 loaf pans. Sprinkle raw sugar on top and bake 350 degrees for 1- 1/4 hour.