Start my covering the rim of the milkshake glass with vanilla frosting using a rubber spatula or wooden spoon. Sprinkle the grinch sprinkles over the vanilla frosting on the rim of the glass. Place the prepared glass in the freezer while you make your milkshake.

In a blender add your ice cream, green food coloring and milk. Blend until creamy. If it's not as green as you'd like, add more food coloring until it reaches your desired color.

Pour the shake into your prepared glass. DO not fill to the brim of the glass, leave about half an inch of room from the top of the glass.

On the top of the milkshake add in your whipped cream. Top the whipped cream with additional sprinkles, add the green candy cake and additional toppings.