1 Preheat oven to 350°F.2 In a large bowl with an electric mixer, cream margarine and sugar together. Add eggs and beat until blended. Add sour cream and bananas; blend.3 Mix soda with flour and add to mixture. Beat on low setting until just mixed, do not over mix. Stir in chocolate chips.4 Pour into a 9 x 4 x 4-inch loaf pan, which has been sprayed with non-stick spray (may flour pan lightly).5 Bake at 350°F for 50 to 60 minutes or 340°F in a glass pan for 65 minutes or until toothpick comes out clean. Let stand in pan about 5 minutes. Remove from pan and cool on cooling rack.