01 -
Place frozen homestyle beef meatballs in a single layer at the bottom of a 4-6 quart slow cooker.
02 -
Pour the can of French onion soup over the meatballs. Sprinkle the beefy onion soup mix evenly on top, then add one cup of low or no sodium beef broth.
03 -
Cover and cook on high for 2 to 3 hours, or on low for 5 to 6 hours, until the meatballs are heated through and flavors meld.
04 -
In a small bowl, combine water and cornstarch, stirring to create a smooth slurry.
05 -
Pour the cornstarch slurry into the slow cooker and stir gently to combine. Re-cover and cook for an additional 10 minutes to thicken the broth.
06 -
Sprinkle shredded mozzarella cheese over the meatballs, cover, and cook until the cheese is fully melted.
07 -
Serve warm, optionally garnished with fresh thyme. Ideal accompaniments include mashed potatoes, egg noodles, or steamed green beans.