**Directions:**
1. Preheat oven to 350°F (175°C).
2. In a large bowl, mix together the ground beef, bread crumbs, onion, egg, milk, salt, and pepper until well combined.
3. Shape the mixture into a loaf and place it in a lightly greased loaf pan.
4. In a small bowl, combine the brown sugar, mustard, and ketchup. Mix well and spread over the top of the meatloaf.
5. Bake for 1 hour, or until the meatloaf is cooked through.
Prep Time: 10 minutes | Cooking Time: 1 hour | Total Time: 1 hour 10 minutes
Kcal: 360 kcal | Servings: 6 servings