Preheat your oven to 350°F (175°C).
In a large mixing bowl, combine peanut butter, granulated sugar, and brown sugar until well blended.
Add in the egg and vanilla extract, mixing until fully incorporated.
In a separate bowl, whisk together flour and baking soda.
Gradually add the flour mixture to the peanut butter mixture, stirring until combined.
Fold in chocolate chips and chopped Reese’s peanut butter cups.
Scoop tablespoon-sized amounts of dough onto a greased baking sheet.
Bake in the preheated oven for 8-10 minutes, or until the edges are lightly golden.
Allow cookies to cool on the baking sheet for 5 minutes before transferring to a wire rack.