Heat oven to 350ºF.
PREPARE cake batter as directed on package. Spray 13x9-inch baking dish generously with cooking spray. Sprinkle dry gelatin mix onto bottom of dish. Top with pineapple; place cherry in center of each slice.
POUR batter over fruit in dish.
BAKE 40 to 45 min. or until toothpick inserted in center comes out clean. Cool 5 min. Loosen cake from sides of dish; invert onto platter. Gently remove dish; cool cake completely. Serve topped with cool whip.
This was good. I was a little nervous about the orange jello but everyone loved it. To cut calories even more I made the batter with unsweented applesauce instead of oil.
Found on Kraft web site.