Add ice cream and milk to a blender, and blend until it gets smooth. You can add more milk if you prefer a watery consistency; however, be sure to let your ice cream soften before scooping so you don't end up adding too much milk Add sprinkles and fold them with a spoon or spatula
Using a spatula, spread the icing on the top of a chilled glass. Using a flat plate, dip your glass in the sprinkles until all the icing is covered
Fill your glass with a milkshake until nearly full. Make sure to keep some room in the cup for the whipped cream
Drizzle the top of the whipped cream with chocolate syrup
Using a wooden skewer place the marshmallows on a skewer, using as much or as little as you wish! Then add your straw and you are ready to enjoy your homemade vanilla bean funfetti milkshake!