Created by KittenCal on October 3, 2012
Step 1: Preheat oven to 350 degrees F. Grease a 8 or 9-inch square baking pan. (this also makes great muffins).
Step 2: In a large bowl, combine flour, sugar, baking powder, baking soda, cinnamon and salt. In a small bowl whisk together yogurt, banana, oil, egg and vanilla. Pour over dry ingredients, and gently stir with a spatula until JUST blended (do not over mix).
Step 3: Spread the batter into prepared baking pan. Bake for about 25 minutes, or until the top of the cake is light brown, and edges begin to pull away from sides of the pan (bake slightly less time for muffins). Cool cake in pan on a rack.