Preheat your oven to 350 °F (175 °C) and using cooking oil spray, spray a 9×9 inch pan.2. In a large mixing bowl, stir together all the ingredients listed above.3. Pour the batter evenly into the pan. Bake for 30 minutes. A toothpick inserted in the middle should come out mostly clean. 4. Let cool for 5 to 10 minutes and top it with powdered sugar. :)