In a large mixing bowl, start by adding your ground beef, breadcrumbs, milk, chopped onion, minced garlic, egg, ketchup, Worcestershire sauce, salt, pepper, and thyme. Using your hands, mix them together gently but thoroughly until just combined.

Once the meat mixture is nicely combined, transfer it to a baking sheet or a loaf pan. Use your hands to shape it into a firm, even loaf, ensuring the surface is smooth and well-formed.

Preheat your oven to 375°F (190°C).

Place the formed meatloaf into the preheated oven and bake uncovered for 45-55 minutes, until the internal temperature reaches 160°F (70°C).

Once baked, remove the meatloaf from the oven and let it rest for 10 minutes before slicing.