In a large bowl, combine cake mix (dry) with undrained can of pineapple. Beat by hand or with electric mixer for about 2 minutes or until combined.
Bake for 35 minutes or until golden brown. Cool on a wire rack.
Slice into 16 servings. Tastes great with light ice cream, light whipped topping, or fruit. (Extra toppings are additional points.) Store leftovers in the refrigerator or freezer for up to 3 days.