In a bowl, combine the peanut butter chips, semi-sweet chocolate chips and sweetened condensed milk. Stir.
Microwave 30 seconds at a time, stirring after each set for a total of 3 minutes (or until the chocolate has melted.
Line a 9x9 pan with parchment paper (this makes clean up super easy) and pour the fudge into the pan.
Top with Skor bits, press into the fudge and toss in the freezer.
Freeze for a few hours, or until fudge has hardened through.