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This is a very easy recipe. You can use your own meatballs that you have frozen or you can buy already prepared frozen meatballs.
- Mix together frozen meatballs, sauce and onion in a crock pot.
- Cover and cook on LOW 4-6 hours or until meatballs are heated through and onion is tender.
- Place meatballs on rolls and top with cheese. Place under broiler for a minute or two to let cheese melt.