Line a 9x9 inch baking pan with parchment paper, leaving some overhang on the sides to help lift the fudge out once it sets.
In a medium saucepan over low heat, combine the butterscotch chips, white chocolate chips, and sweetened condensed milk. Stir continuously until melted and smooth.
Remove from heat and stir in the vanilla extract to enhance the flavors.
Fold in the coarsely chopped Peanut Butter Oreos and mini Reese's Pieces until evenly distributed.
Pour the fudge mixture into the prepared baking pan and spread evenly. Sprinkle additional mini Reese's Pieces on top.
Refrigerate for at least 2 hours, or until firm. Use the parchment paper to lift the fudge out of the pan onto a cutting board.
Cut into squares and serve. Enjoy!