Line a 9 inch baking pan with foil or parchment paper.
Lay unwrapped peanut butter cups across the bottom of the pan (rows of 4).
In a saucepan over low heat, melt together chocolate chips and condensed milk. Once completely melted and smooth remove from heat, and stir in vanilla.
Pour over peanut butter cups.
Sprinkle crushed cups over the chocolate, lightly pressing down.