Combine the thawed whipped topping and dry pineapple gelatin mix in a sizable bowl. Blend the ingredients using a rubber spatula, ensuring you scrape the bowl’s sides.
Fold in the cottage cheese, mixing it in until well combined.
Next, add the drained pineapple pieces and mini marshmallows to the bowl. Carefully blend until all elements are well distributed.
Either chill the salad in the fridge until you’re ready to serve or serve immediately. Enjoy this luscious, creamy pineapple fluff salad!