Heat oven to 350 Blend together cake mix, apple pie filling and eggs. Beat 2 minutes at medium speed. Combine sugar and cinnamon. Spread half the batter in to prepared 13x9 inch pan, sprinkle with cinnamon sugar, pour over remaining batter and sprinkle with the remaining sugar mixture. Bake for 30-35 minutes, use pick test. I top with cool whip with a teaspoon of cinnamon blended in. Also, the batter looks very thick, it's okay, so don't add anything else.It comes out moist and is delicious.