2 cups vanilla ice cream
1/2 cup milk
2 cubes ice, or more if desired (optional)
1 cup creamy peanut butter
1 cup marshmallow fluff (such as Fluff®)
1 teaspoon vanilla extract
Blend ice cream, milk, and ice together in a blender just until it is starting to blend together, but still chunky. Add peanut butter, marshmallow fluff, and vanilla extract; blend until desired consistency is reached.