Add grape jelly, chili sauce, and cayenne pepper to a saucepan over medium-high heat. Cook for about 5 minutes making sure the mixture is well combined. To save time skip this step and add these directly on top of the meatballs in the slow cooker for a more speedy process.
Place meatballs in a slow cooker and top with grape jelly mixture (for less mess use a crock pot liner).
Cook on LOW for 3 to 4 hours.
Video
Notes
Store leftovers in an airtight container in the refrigerator for 3-4 days or freezer for up to 4 months.