Step 1

Preheat the oven to 350F.

Step 2

Remove 15 oranges from the can and set to the side for topping. Reserve the rest of the oranges and the liquid for the cake mix.

Step 3

In a large mixing bowl combine the yellow cake mix, vegetable oil, sour cream, eggs and the remaining oranges with liquid.

Step 4

Pour into a greased 9x13 casserole dish. Bake based on the time designated on the box, about 30 minutes. Remove from the oven, transfer to wire rack, and allow to cool completely about an hour.

Step 5

In another large mixing bowl combine the heavy whipping cream, powdered sugar, and instant vanilla pudding mix. Use a handheld mixer to whip into a thick, creamy topping. Mix in the crushed pineapple and its juice just until combined.

Step 6

Top the cake with the whipped frosting.

Step 7

Decorate with reserved mandarin oranges and pineapple tidbits.