Blend the Base: In a blender, combine the chocolate ice cream, milk, peanut butter, and chocolate syrup. Blend until smooth and creamy, about 30 seconds.
Adjust Consistency: If the milkshake is too thick, add a splash more milk until the desired consistency is reached. Blend briefly to mix.
Serve: Pour the milkshake into tall glasses.
Top It Off: Add a generous dollop of whipped cream on top and drizzle with extra chocolate syrup. If feelin' fancy, sprinkle crushed chocolate cookies or sprinkles to jazz it up!
Enjoy: Grab a straw and dive in—your taste buds are in for a treat!