In the bowl of an electric mixer, add the nonfat Greek yogurt. Beat on medium-high speed for about 10 minutes until light and fluffy.

Gradually add the orange-flavored Jello powder to the whipped yogurt, mixing until fully incorporated.

Gently fold the nonfat whipped topping into the yogurt mixture using a spatula, being careful not to deflate the fluffy texture.

Stir in the canned mandarin oranges and pineapple pieces, ensuring they are evenly distributed.

Carefully fold in the mini marshmallows, ensuring they are just incorporated into the fluffy mixture.

Transfer the mixture into a large serving bowl and cover with plastic wrap. Refrigerate for at least one hour.

Once chilled, spoon out the Easy Greek Yogurt Orange Fluff into individual serving dishes. Serve cold.