Follow the instructions of the cake mix, I prefer the Betty Crocker brand. Instead of adding water, substitute the water for the can of mandarin oranges. Make sure to add the juices as well as the mandarin fruit.

Bake the cake in the oven at 350 degrees

While the cake is baking, prepare the frosting by combining the cool whip, condensed milk, and instant pudding.

Drain the pineapples completely and fold them into the frosting.

Place the frosting in the freezer until the cake has baked and completely cooled down

Once the cake has completely cooled you can go ahead and frost it

Optional: Decorate the frosted cake with mandarin oranges