Place the white melting chocolate, semi-sweet chocolate chips, and milk chocolate chips into a 6 or 8-quart slow cooker. Place the slow cooker over low heat for 1-2 hours.
Stir the chocolate around every 15 minutes or so to make sure it doesn't burn.
Line sheet trays with parchment paper. You will need a lot of them, set aside.
Once the chocolate is melted, add the peanuts and salt. Stir to combine so the peanuts are coating in the chocolate.
Start placing 2 tablespoon-sized dollops of the mixture onto the paper-lined sheet trays. I like to press them down, so they are not too tall, making them easier to bite into once set.
Continue to make the clusters, being careful they are not touching until all of the mixture is used up.
Let them sit until fully set, about 3 hours. Serve or package into containers with wax or parchment paper between the layers for storage.
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