In a large mixing bowl, combine ground beef, breadcrumbs, Parmesan cheese, egg, chopped onion, garlic powder, salt, and pepper. Mix until well combined.
Form the mixture into 1-2 inch meatballs and layer them in the bottom of the crockpot.
In a separate bowl, mix beef broth with the French onion soup mix until well blended. Pour this mixture evenly over the meatballs.
Cover and cook on low for 6-8 hours or on high for 3-4 hours. About 15 minutes before serving, sprinkle shredded mozzarella cheese on top.
Serve the meatballs in shallow bowls with broth, garnished with fresh parsley if desired.
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Notes
Store leftovers in airtight containers in the refrigerator for up to 3 days or freeze for up to 3 months.