Preheat your oven to 350°F (175°C).
In a large bowl, combine ground beef, rice, onion, milk, egg, garlic powder, Worcestershire sauce, salt, and black pepper.
Shape the mixture into 1- to 2-inch meatballs and place them in a baking dish.
In a mixing bowl, combine the tomato sauce and Italian herbs, stirring until smooth.
Pour the tomato sauce mixture evenly over the meatballs in the baking dish.
Cover the baking dish with foil and bake for 45 minutes.
Remove the foil and bake for an additional 15 minutes, until the meatballs are cooked through.
Serve the meatballs hot, garnished with fresh herbs if desired.