Blend the Ingredients: In a blender, combine the vanilla ice cream, milk, and chocolate syrup. Blend until smooth and creamy, adjusting the milk quantity to achieve desired thickness.
Serve: Pour the milkshake into tall glasses. Top with whipped cream, chocolate shavings or sprinkles, and a maraschino cherry if desired
Enjoy: Serve immediately with a straw and enjoy your delightful blast from the past!