Preheat oven to 350°F. Grease a 9 x 13 baking pan with nonstick spray.
In a large bowl (batter will expand and get foamy), add the cake mix and the entire contents of the pineapple can.
Pour batter into your greased pan.
Bake on the center rack for 40 -45 minutes or until a toothpick inserted in the center of the cake comes out clean. The cake will be springy to the touch and have a deep, golden-brown color.
Run a rubber spatula around the outside of the cake. Carefully flip the cake over and allow it to cool before serving.
Notes
Nutritional values may vary and are meant to be a guide.