Stir the marshmallow crème in a large bowl to loosen it up (it mixes more smoothly this way).
Add the mint flavoring
Start with a small amount of peppermint extract, then taste and adjust.
If using crème de menthe, add it gradually so the flavor stays balanced.
Add the chocolate element
If using cocoa powder, whisk it in until the mixture looks uniform and no dry streaks remain.
If using crème de cacao, stir until the mixture is silky and evenly colored.
Fold in whipped topping gently, in 2–3 additions.
Key technique: Use a spatula and a “scoop and fold” motion. Overmixing knocks out the air that makes this no-bake freezer dessert feel fluffy.
Visual cue: The filling should look light, smooth, and thick enough to mound slightly in the bowl.