1/2 cup crushed peanut butter sandwich cookies (about 5 cookies)
Line a small baking sheet with parchment paper.
Place the chocolate chips in a microwave-safe bowl. Microwave on low in 30-second intervals, stirring after each interval, until melted and smooth, about 2 minutes. Pour the melted chocolate onto the parchment-lined baking sheet. Spread the chocolate into a thin layer using a small offset spatula. Sprinkle the crushed cookies over the melted chocolate in an even layer.
Allow the bark to set in a cool area until firm, about 4 hours. The baking sheet can also be refrigerated to speed up the cooling time. Break the bark into pieces to serve.