Begin by placing nonfat Greek yogurt in an electric mixer bowl fitted with a whisk attachment. Beat the yogurt until it achieves a light and fluffy consistency, which usually takes around 10 minutes.
Add the sugar-free orange Jello to the yogurt and beat until fully incorporated.
Stir in the nonfat whipped topping until a velvety blend is achieved.
Introduce the drained mandarin oranges and crushed pineapple, stirring until fully combined.
Gently fold in the mini marshmallows to enhance the delightful texture.
Refrigerate the mixture for at least one hour before serving.
