Banana Cinnamon Cake(Low-Fat)  
["1 1/2 c. all-purpose flour", "1/2 c. sugar", "2 tsp. baking powder", "1 tsp. baking soda", "1 tsp. cinnamon", "1/2 tsp. salt", "1 c. nonfat plain yogurt", "3/4 c. mashed ripe banana", "2 Tbsp. vegetable oil", "1 large egg or egg substitute", "1 tsp. vanilla extract", "powdered sugar (optional)"]
["Preheat oven to 400\u00b0.", "Spray 9-inch square baking pan with vegetable oil spray.", "Combine flour, sugar, baking powder, baking soda, cinnamon and salt in large bowl.", "Whisk together yogurt, banana, oil, egg and vanilla in medium bowl or food processor. Pour over dry ingredients and stir gently until just blended.", "Do not overmix.", "Spread batter in prepared pan.", "Bake until top of cake is lightly brown and the sides pull away from the sides of the pan, approximately 20 minutes.", "Cool cake in pan on rack 10 minutes.", "Loosen sides with spatula and turn over on rack.", "Invert cake and let cool completely.", "Sprinkle lightly with powdered sugar."]
["flour", "sugar", "baking powder", "baking soda", "cinnamon", "salt", "nonfat plain yogurt", "mashed ripe banana", "vegetable oil", "egg", "vanilla extract", "powdered sugar"]