In a mason jar, mix vodka and Reese’s Pieces. Close the jar tightly and shake. Let it sit in the refrigerator overnight, then strain.
Fill a cocktail shaker with ice, then add the strained vodka, milk, and chocolate liqueur. Shake until chilled.
Spread peanut butter on one small plate and crushed Reese’s Pieces on another. Dip the tops of two cocktail glasses in peanut butter, then roll them in crushed Reese’s Pieces.
Drizzle about a tablespoon of chocolate syrup into each glass. Divide the cocktail mixture between glasses and garnish each with a peanut butter cup.
Get ready to indulge in the ultimate peanut butter cup martini experience!