Drizzle chocolate syrup and peanut butter sauce inside the glass. Add a small layer of crushed peanut butter cups at the bottom.
Blend the cocktail
In a blender, add vodka, coffee liqueur, Irish cream, chocolate liqueur, peanut butter liqueur, milk or half-and-half, and ice. Blend until smooth and creamy.
Pour and layer
Pour the mixture into the prepared glass. Add extra chocolate syrup and peanut butter sauce around the inside for a rich dripping effect.
Add toppings
Top with whipped cream, chopped peanut butter cups, chocolate syrup, peanut butter sauce, and mini peanut butter cups.
Serve immediately
Serve cold with a straw or dessert spoon.
Optional dessert version
Add 1 scoop of vanilla or chocolate ice cream before blending for a thicker frozen Peanut Butter Cup Mudslide.