Preheat your oven to 400°F (200°C).

In a large mixing bowl, combine ground beef, breadcrumbs, milk, finely chopped onion, minced garlic, egg, Worcestershire sauce, salt, pepper, and the dried herbs. Mix gently.

Shape the meat mixture into 1.5-inch meatballs and place them on a baking sheet.

Bake the meatballs for about 20 minutes until browned and cooked through.

In a large pot, boil salted water and add chopped potatoes. Cook until fork-tender, then drain.

Mash the potatoes with garlic, butter, and milk until creamy. Season with salt and pepper.

In a frying pan, whisk flour for 1-2 minutes, then gradually add beef broth, stirring to prevent lumps. Stir in soy sauce and mustard until thickened.

Add the baked meatballs to the gravy, allowing them to simmer for a few minutes.

Serve mashed potatoes topped with meatballs and gravy, garnished with fresh parsley.