**Instructions**
1. In a large bowl, dissolve the Jell-O powder in 1 cup of boiling water. Stir until completely dissolved.
2. Add 1/2 cup of cold water to the Jell-O mixture and stir well. Set aside to cool slightly.
3. In a separate bowl, beat the softened cream cheese until smooth and creamy.
4. Gradually add the slightly cooled Jell-O mixture to the cream cheese, beating until well combined and smooth.
5. Gently fold in the thawed Cool Whip until no streaks remain. Be careful not to overmix, as this can deflate the fluffiness.
6. Fold in the well-drained crushed pineapple. If using, gently fold in the mini marshmallows now.
7. Pour the mixture into a serving bowl or individual dessert cups.
8. Refrigerate for at least 4 hours, or until thoroughly set.
9. Before serving, you can garnish with fresh fruit like sliced strawberries, mandarin orange segments, or a sprig of mint.
**Short Tips**
* For an extra tangy kick, try using a little lemon juice in your cream cheese mixture.
* Make sure your crushed pineapple is *very* well-drained; excess liquid can make your fluff watery.
* Don’t be afraid to experiment with different Jell-O flavors and even add-ins like chopped nuts (pecans work well with tropical flavors!).
* For individual portions, layer the Jello Fluff with graham cracker crumbs or crushed cookies for a delicious base.
