In a large bowl, whisk the vanilla pudding mix with 1 cup of boiling water until it’s smooth and fully dissolved.

Stir in ½ cup of cold water to cool it down.

Place the bowl in the fridge and let it chill for 15 minutes. It should start to thicken but still be soft.

Gently fold in the Cool Whip, then add the mandarin oranges and mini marshmallows. Mix carefully so the oranges don’t fall apart.

Cover and chill for at least 1 hour. Serve cold and fluffy!