This is a simple, chewy apple yogurt cake recipe that doesn't require draining, made with one apple, yogurt, and pancake mix. Peel the apple, dice it, and heat it in the microwave with granulated sugar. Add this to the batter made with yogurt, pancake mix, and granulated sugar. Slice the remaining apple with the skin on and decorate the top of the cake, sprinkle with powdered sugar, and bake in the oven. The result is a moist and chewy cake with a perfect balance of apple sweetness and yogurt tartness, and it's easy to make and delicious.