Preheat oven to 350 degrees F. Combine first four ingredients in a large bowl; beat well at medium speed. Combine banana, oats and milk; add to sugar mixture, beating well. Spoon flour into dry measuring cups; level with a knife. Combine flour, baking powder, baking soda, salt and cinnamon. Add to sugar mixture; beat just until moist. Spoon batter into a 9-by-5-inch loaf pan coated with cooking spray. Bake at 350 degrees F for one hour and 10 minutes or until a wooden pick inserted in the center comes out clean. Cool 10-15 minutes in pan on a wire rack; remove from pan.