Combine lean ground beef, egg, milk, bread crumbs, minced onion, salt, nutmeg, garlic powder, Worcestershire sauce, and pepper in a bowl.

Mix all ingredients thoroughly.

Shape the mixture into 1-inch meatballs.

Place the meatballs in a 2-quart microwave-safe baking dish.

Microwave on Medium power for 6 to 8 minutes, or until fully cooked, turning the meatballs over halfway through.

Transfer cooked meatballs to a serving dish.

Reserve drippings from the baking dish for later use in sauces if desired.

Serve meatballs plain or with your favorite sauces.