Spray a 9 x 13 pan with cooking spray. Set aside.Add butter, powdered sugar, 1 cup peanut butter and graham cracker in a large bowl. Mix to combine.
Layer into the prepared pan.
Add the 1/2 cup of peanut butter and chocolate chips to a small bowl. Microwave in 15 second intervals until fully melted.
Pour onto of the peanut butter layer and smooth with a rubber spatula.
Place in the refrigerator to firm up for an hour.
To serve, cut into squares and enjoy!
Notes
To slice these barsI recommend running a knife under hot water before slicing. This helps slicing them into perfect squares!Don't have graham crackers? You can substitute Oreos, golden graham's, cheerios or Biscoff cookies!