Preheat oven to 350 degrees. Spray a 9x13 baking dish with nonstick cooking spray.

Pour peach pie fillings into bottom of baking dish and evenly spread out.

In a medium bowl place dry cake mix and 7-up, stir to combine.

Pour batter over peach pie filling.

Place baking dish in oven and bake for 45 minutes to 1 hour. Check for doneness by inserting a toothpick into cake. It should pull out clean or have a few crumbs on it.

Serve with cool whip or ice cream.