Prepare two baking sheets with parchment paper. Set aside.

Melt Chips: In a large bowl, mix together chocolate chips, peanut butter chips, butter, and peanut butter. Microwave on low power for 1-2 minutes, stirring every 20 seconds, until smooth (be careful not to scorch the chocolate!) You could also put everything in a double boiler to melt.

Add peanuts and pretzels to the melted chocolate mixture and gently stir to coat.

Drop spoonfuls of mixture onto prepared baking sheets. Refrigerate for 30 minutes, or until chocolate has set.

Store peanut clusters in an airtight container in the refrigerator for up to 1 month.