Step 1

Preheat the oven to 350 degrees Fahrenheit. Grease and flour three 8-inch round cake pans.

Step 2

Make the cakes: In a large mixing bowl, combine the yellow cake mix, the entire can of mandarin oranges (including the juice), eggs, vegetable oil, and sour cream with an electric mixer until well combined. The oranges will break down into small pieces.

Step 3

Divide the batter evenly between the prepared pans. Tap the pan lightly on the counter to settle the batter.

Step 4

Bake for 25-30 minutes or until a toothpick inserted into the center comes out clean. Set aside to cool.

Step 5

Make the frosting: In a large bowl, whisk half of the thawed whipped topping with the dry pudding mix until smooth. Fold in the rest of the whipped topping and crushed pineapple.

Step 6

When the cake layers are cool, spread a generous amount of the frosting between each layer as you stack them. Then, frost the top and sides of the assembled cake.

Step 7

Garnish with orange slices, if desired, and chill until ready to serve. Enjoy!