Preheat the Oven: Preheat your oven to 375°F (190°C). Line a baking sheet with aluminum foil or lightly grease a loaf pan.

Mix the Meatloaf Ingredients: In a large mixing bowl, combine the ground beef, breadcrumbs, diced onion, grated carrot, minced garlic, egg, milk, Worcestershire sauce, ketchup, Dijon mustard, thyme, paprika, salt, and pepper. Use your hands or a wooden spoon to mix until everything is well combined, but be careful not to overmix, as it can make the meatloaf tough.

Shape the Meatloaf: Transfer the meat mixture to the prepared baking sheet or loaf pan. Shape it into a loaf, ensuring it’s compact and evenly shaped for even cooking.

Make the Topping: In a small bowl, whisk together the ketchup, Dijon mustard, apple cider vinegar, and honey (if using). Spread this mixture evenly over the top of the meatloaf.

Bake the Meatloaf: Place the meatloaf in the oven and bake for 45-50 minutes, or until the internal temperature reaches 160°F (70°C). If you want a crispier exterior, you can remove the foil for the last 10 minutes of cooking.

Rest and Serve: Once baked, let the meatloaf rest for about 5 minutes before slicing. This helps retain the juices and keeps the meatloaf moist.