Dissolve the Jello in a large mixing bowl by mixing the orange Jello mix with 1 cup of boiling water for 2-3 minutes until smooth.

Add ½ cup of cold water to the Jello mixture to cool it down.

In a separate bowl, whisk in the instant vanilla pudding mix to the cooled Jello mixture until smooth.

Gently fold in 8 oz of Cool Whip until fully combined and creamy.

Mix in 2 cups of mini marshmallows, 2 cans of drained mandarin oranges, and 20 oz of well-drained crushed pineapple, folding gently.

Transfer to a serving dish, cover with plastic wrap, and refrigerate for at least 2 hours to chill and set.