1In the large bowl of mixer, beat together first 5 ingredients til mixture is blended. Add the flour, baking powder, baking soda, and salt all at once. Beat til blended. Don't overbeat. Stir in banana, chocolate and walnuts.
2Divide mixture between 2 greased 6 x 4 inch loaf pans. Place pans on cookie sheet and bake at 350 for 30 to 35 minutes or til cake tester inserted in center comes out clean. Allow to cool in pan for 10 minutes, remove loaves from pan and continue cooling on rack. Brush tops lightly with sour cream glaze. Makes 2 loaves
3Sour Cream Glaze:
1 Tbsp. sour cream
1/4 cup sifted powdered sugar
1/4 tsp. vanilla
2 Tbsp. finely chopped walnuts
Stir together all ingredients til blended.
The recipe for the bread can be doubled, making 4 loaves. The bread freezes well. Wrap in double thicknesses of plastic wrap and then foil. Remove wrappers while defrosting