Place the frozen meatballs into your crockpot.
Sprinkle the ranch seasoning and au jus gravy mix evenly over the meatballs.
Place the stick of butter on top of the meatballs.
Add the pepperoncini peppers.
Cover and cook on low for 4-5 hours or on high for 2-3 hours, until heated through and tender.
Serve as an appetizer or over mashed potatoes, rice, or noodles for a full meal.