Line a 9x9 inch pan with foil and coat with cooking spray.

Place 16 peanut butter cups in an even layer on the bottom of the pan. (if you use an 8x8, use 14 reese's)

Place chocolate chips and sweetened condensed milk in a medium saucepan over low heat.

Stir until chips and milk melt together.

Once everything is melted, spread evenly over peanut butter cups in prepared pan.

Crumble remaining Reese’s peanut butter cups and sprinkle over top, pressing them lightly into the fudge.

Cool on countertop until fudge reaches room temperature, then cover with plastic wrap and place in the refrigerator to harden completely.

Cut into squares and serve.

Yields 32.