Place a plastic crockpot liner bag in the bowl of your slow cooker. Spread it out to fit leaving the excess hanging over the outer edges of the device.
Add the almond bark to the bottom of the crock, spreading it out in an even layer. Break up the German chocolate bar and spread that evenly out overtop.
Sprinkle all the chocolate chips evenly out over the other chocolates.
Spread the peanuts out in an even layer on top.
Add the lid to close and cook on HIGH for 1 hour. Do not open; do not stir.
Switch to the LOW heat setting. Open the lid, and give everything a good stir but be careful not to displace your liner too much.
Return the lid and continue cooking on LOW and continue cooking another hour, stirring again at the 30 minute mark. Stir a final time at the 1 hour mark.
Spread a large sheet of parchment paper onto a clean countertop.
Drop large spoonfuls of the chocolate covered peanuts onto the waiting parchment paper, leaving space in between each cluster for them to spread slightly without touching. Continue until all the mixture has been used, moving to new sheets of parchment paper, if needed.
Let the crockpot peanut clusters rest for 2-3 hours, or until the chocolate is completely set.
Serve them now, or store them in zip-locking bags in the fridge until ready to serve.