In a blender, add 200 ml of chilled milk, 4 KitKat chocolate bars (12 grams each), 2 scoops of chocolate ice cream, and 2 tablespoons of chocolate syrup. Blend until smooth and creamy.
Pour the milkshake into two tall glasses.
Garnish with whipped cream, a drizzle of chocolate syrup, and a small piece of KitKat on top.