In a large bowl, combine ground beef, onion, garlic, egg, bread crumbs, milk, salt, pepper, Worcestershire sauce and parsley. Mix gently but thoroughly.

Divide the mixture into four equal portions. Shape each portion into a round patty about ¾ inch thick. Press lightly in the center to prevent bulging during cooking.

Heat vegetable oil or butter in a large skillet over medium heat. Make sure the oil is hot but not smoking to sear patties evenly.

Place patties in the skillet. Cook 4-5 minutes per side, until browned and cooked through. Avoid pressing down to keep juices inside.

Remove patties from skillet and place on a plate. Let rest 3-5 minutes to allow juices to redistribute. Serve warm with your favorite sides.