Prepare the pudding base: In a large mixing bowl, whisk together the instant vanilla pudding mix and cold milk for about 2 minutes until it starts to thicken. Let it sit for 5 minutes to fully set – this creates the creamy foundation of your Oreo Fluff recipe.

Fold in the whipped topping: Gently fold the thawed whipped topping into the pudding mixture using a spatula. Be careful not to overmix; you want to keep it light and airy for that signature fluff texture.

Add the mix-ins: Stir in the crushed Oreo cookies and mini marshmallows (if using). Reserve a handful of crushed Oreos for topping to add visual appeal and extra crunch.

Incorporate cream cheese (optional): If you're using cream cheese, beat it until smooth in a separate bowl, then fold it into the mixture before adding the Oreos. This step elevates the fluff to a more decadent level.

Chill and serve: Cover the bowl with plastic wrap and refrigerate for at least 1-2 hours. This allows the flavors to meld and the texture to firm up. Scoop into bowls or serve as a dip!