Non-stick vegetable oil spray
1 1/2 c. all purpose flour
1/2 c. sugar
2 tsp. baking powder
1 tsp. baking soda
1 tsp. ground cinnamon
1/2 tsp. salt
1 c. plain non-fat yogurt
3/4 c. mashed ripe banana
2 tbsp. vegetable oil
1 lg. egg
1 tsp. vanilla extract
Powdered sugar

Preheat oven to 400 degrees. Spray 9" 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. Pour over dry ingredients and stir gently until just blended. Do not overmix. Spread batter in prepared pan. Bake until top of cake is light brown and edges begin to pull away from sides of pan, about 20 minutes.

Cool cake in pan on rack 10 minutes. Loosen sides of cake with spatula and turn out onto rack. Invert cake right side up and cool completely. Transfer to plate. Sprinkle lightly with powdered sugar.