Layer all ingredients into a slow cooker. I started with the peanuts and then added the morsels on top. Cook on low for 2 hours, covered. Remove lid and stir to combine all ingredients well. Replace the slow cooker lid and continue to cook on low for 30 more minutes. At this point if you need a thinner consistency add the vegetable oil. Drop mixture onto wax paper using a spoon and let harden (about an hour).