To make the rice krispie treats, add the butter to a large pot over medium heat. Whisk constantly until the butter is sizzling and brown bits begin to form in the bottom of the pot, about 5 minutes. Turn the heat down to low and immediately add the marshmallows, stirring continuously with a wooden or heat safe spoon until melted. Stir in the vanilla extract. Turn off the heat and add the cereal, stirring until it’s all combined with the marshmallows. Press the mixture into an 8×8 baking dish and let it sit for 15 minutes.

To make the milkshakes, add the milk, vodka, ice cream and marshmallow fluff to a blender. Take about 3/4 of the rice krispie mixture and break it apart, tossing it into the blender. Blend and pulse until the milkshakes come together then pour them in glasses. Take the remaining rice krispie treats and cut them into small chunks, placing them on top of the shakes with fat straws. Serve immediately with fat straws. They are a must!