Classic cocktail meatballs have been a popular appetizer for years and for good reason, but I gave them a sweet and spicy update with spicy pepper jelly and sweet and tangy bbq sauce. These slow cooker sweet and spicy pepper jelly meatballs are going to quickly become your new favorite appetizer to take to any gathering all year long. Not only are they easy to prep, but the slow cooker does the work for you making them ideal for the busy holiday season.