In a blender, combine ice cream, milk, and any mix-ins, and blend until pourable.
Pour into a glass, top with whipped cream if desired, and enjoy!
Notes
*Use ½ cup milk for a thicker shake, ¾ for a thinner one.This will make approximately 1½ to 2 cups, enough for one restaurant-sized shake or two smaller ones. Approximate nutritional information is for two vanilla milkshakes.