Begin preparing your favorite meatballs following recipe/package instructions.
While meatballs cook, melt butter in a large skillet over medium heat, then add garlic and sauté for 3 minutes. Whisk in flour, then gradually whisk in beef broth, followed by cream. Simmer, stirring frequently, for about 10 minutes or until the sauce has thickened. Whisk in mustard and salt.
Serve immediately over cooked meatballs (layered on a bed of rice or noodles if desired). Store leftovers in refrigerator for up to 5 days.
*I use this recipe for air fryer meatballs but you can use any recipe or preprepared meatball that you like. If you opt for a chicken or turkey meatball, replace the beef broth with chicken or vegetable broth.