In a large saucepan, combine 6 ounces of orange gelatin and two 3-ounce packages of vanilla cook and serve pudding mix. Gradually add in 4 cups of hot water while stirring continuously.

Place the saucepan over medium heat and bring the mixture to a boil, stirring frequently. Cook for an additional 2 minutes once boiling.

Carefully pour the hot mixture into a large bowl, cover with plastic wrap, and refrigerate for at least 4 hours or overnight.

Once set, gently fold in 8 ounces of Cool Whip, taking care not to deflate the fluffiness.

Stir in the drained 16-ounce can of mandarin oranges into the fluffy mixture and return to the refrigerator until ready to serve.