Created by Margarita on September 16, 2013
Step 1: Heat oven to 350 degrees F.
Step 2: Combine sugar, sour cream, vegetable oil, milk, eggs, and vanilla in a large bowl; beat until creamy.
Step 3: Add mashed bananas; continue beating until well mixed.
Step 4: In a small cup or bowl combine the flour, baking soda, salt and cinnamon, if using. Add to wet mixture beating at low speed until moistened...or better still, use a large spatula for mixing.
Step 5: Gently stir in walnuts.
Step 6: Spread into 4 greased 3-by-5-inch baking pans.
Step 7: Bake for 35 to 40 minutes or until toothpick inserted in center comes out clean. Cool 10 minutes; turn out of pan. Cool completely. Cut into slices.