Bake meatballs according to package directions. (Typically at 375°F for about 15-20 minutes).
Boil the egg noodles while the meatballs are baking, if using.
While the meatballs are baking, make the sauce. Melt the butter in a large skillet over medium heat. Whisk in the flour and cook for about 30-60 seconds. Then, whisk in the stock until no lumps remain. Add onion powder, garlic powder, salt, pepper, and Worcestershire sauce. Whisk in the half and half and cook, stirring often, until thickened.
Once the meatballs are cooked through, add them to the sauce and toss to coat.
Serve hot with cooked egg noodles.
Notes
Store leftover meatballs in the sauce in an airtight container for up to 3 days in the refrigerator.