Right before serving, give the fluff a gentle stir to redistribute any juices and mix-ins. Serve cold straight from the bowl, and refrigerate any leftovers for up to 2–3 days.
You can easily tweak this fluff to fit what you have on hand or what your family likes. For a stronger orange flavor, add 1–2 teaspoons of orange zest or a splash of orange juice concentrate when you fold in the whipped topping. If you prefer more texture, bump the mini marshmallows up to 3 cups or add 1/2 cup of shredded sweetened coconut. For a lighter version, use sugar-free orange gelatin, sugar-free instant vanilla pudding, and light whipped topping; it will still set up nicely, just a bit softer. You can also swap the mandarin oranges for diced fresh oranges or a mix of oranges and pineapple (just drain very well so the fluff doesn’t get runny). If you’re making this for a picnic or potluck, assemble it the night before and give it a quick stir before serving—the flavor actually gets better as it sits. To dress it up for a shower or holiday, spoon the fluff into small glasses and top with a few extra mandarin segments or a sprinkle of crushed vanilla wafers for a little crunch on top.
