For Donuts 3/4 cup all-purpose flour 1 teaspoon baking powder 1/2 teaspoon cinnamon 1/4 teaspoon salt 1/2 cup granulated sugar 1 large egg 1/2 cup mashed banana (about 1 medium banana) 1/4 cup vegetable oil 1 teaspoon vanilla extract For Topping 2 tablespoons creamy peanut butter 1/2 cup + 1 tablespoon powdered sugar 1-2 tablespoons