Add cream cheese and marshmallow fluff to a mixing bowl and beat with an electric mixer until combined.
Serve immediately or refrigerate for up to 4 days. Bring to room temperature before serving.
Notes
Serve with your choice of fruit, such as apples, strawberries, grapes, or melon, or with pretzels, cinnamon sugar pita chips, or pretzel sticks. We think this dip is perfect just as it is, but you can mix in a teaspoon of your favorite extract. The marshmallow already has lots of vanilla flavor, but you could add more or use orange, lemon, strawberry, or other flavored extracts to suit your tastes.