Preheat oven to 350°F (177°C). Line bottom and sides of an 8-inch or 9-inch square baking pan with aluminum foil, leaving an overhang on all sides. Set aside.

In a food processor or blender, pulse salty pretzels into a fine crumb. See photo above for how it will look. Stir the pretzel crumbs, sugar, and melted butter together in a medium sized bowl. Press evenly into the lined pan. Bake for 10-12 minutes. Remove from the oven and allow to slightly cool as you prepare the filling.

Beat cream cheese, egg, sugar, peanut butter, and vanilla extract together with a hand or stand mixer until smooth and creamy, about 3 full minutes. Fold in the chopped Reese’s cups and spread the mixture over crust. Bake for 28-32 minutes, or until the cheesecake has set up and the edges are lightly browned. Allow to cool completely in the refrigerator for at least three hours. Lift the foil out of the pan and cut into squares.

Melt the peanut butter and chocolate chips together in a small bowl in the microwave. Stir until smooth and drizzle over squares.

Store bars in a covered container for up to 10 days in the refrigerator.