Preheat oven to 350F. Grease a 9x13" cake pan and set aside.
In the bowl of a stand mixer fitted with the paddle attachment (or in a large mixing bowl with an electric hand mixer), combine cake mix, crushed pineapple (and its juice), oil, and eggs.
Mix on low speed for about 30 seconds, then scrape down the sides of the bowl. Increase speed to medium high and beat for two more minutes.
Pour batter into prepared pan and bake in preheated oven for 35-40 minutes, or until a toothpick inserted in the center of the cake comes out clean. Remove from oven and let cool completely.
Once the cake is completely cooled, spread whipped topping evenly over the cake. Then slice and serve!
Notes
Leftover cake should be covered and refrigerated.
Feel free to use reduced fat Cool Whip if preferred. You can also skip the whipped topping and dust with powdered sugar instead.
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