In a tall glass, stir together the ice cream, milk, and marshmallow fluff until it has reached your desired milkshake consistency.
Add the Rice Krispies and gently stir them in.
Top with whipped cream and a cherry if desired. You can also sprinkle some of the cereal on top.
Recipe Tips
If you don't want to buy both the marshmallow fluff and cereal, you can use the Frosted Krispies cereal. Make it the same way but without the marshmallow fluff. It’s good that way too, but not the same as with using the fluff and cereal.