Drizzle some chocolate sauce around the inside and on the rim of your serving glass. If you like, press some chopped Reese’s Peanut Butter Cups onto the rim for decoration (optional).
In a blender, add chocolate ice cream, peanut butter, and whole milk. Blend until smooth and creamy.
Pour the milkshake into your prepared glass. Top with whipped cream, drizzle more chocolate sauce, and add a few Reese’s pieces on top if you like.