Layer all of the ingredients in order in a 6-quart slow cooker. Cover and cook on low for 2 hours.

Remove the lid and stir to combine. If not all of the chocolate is melted, cover and cook for an additional 30 minutes on low

Using a spoon or cookie scoop, scoop mounds of the clusters onto parchment-lined baking sheets. Allow to sit at room temp until completely set, 1-2 hours. The clusters can be stored in an airtight container in the refrigerator for up to 1 month. They also freeze very well