In a medium bowl, dissolve the orange gelatin in 1 cup of boiling water. Stir until completely dissolved. Add the cold water and mix well. Let it cool to room temperature, or place it in the fridge for about 10 minutes to speed up the cooling process.
Mix the Fluff Base:
Once the gelatin has cooled, whisk in the sour cream until fully combined. Then, fold in the whipped topping, creating a smooth and creamy texture.
Add the Add-ins:
Gently fold in the mini marshmallows and chopped mandarin oranges (if using). The oranges add a burst of citrus flavor and the marshmallows provide a delightful chewiness.
Chill:
Pour the mixture into a serving dish or individual cups and refrigerate for at least 2 hours, or until set and firm. The fluff will thicken as it chills, giving it a light, airy texture.
Serve:
Before serving, garnish with crushed graham crackers or Nilla wafers for an extra crunch, if desired. Serve chilled and enjoy the creamy, citrusy goodness!
Serving and Storage Tips:
