In a medium skillet, heat the oil over medium heat. Add the chopped onions and cook for about 2 minutes.
Add the garlic, dried thyme, salt, and pepper to the skillet. Cook, stirring occasionally, for another minute, then remove from heat and set aside.
Place the ground beef in a medium bowl. Add the cooked vegetables, Worcestershire sauce, egg, and breadcrumbs. Using a large spoon, mix until everything is fully combined. Shape the mixture into an oval and place it in a lightly greased small baking dish.
Bake in the preheated oven for 30 minutes.
In a small bowl, whisk together the ketchup and molasses. Spoon this glaze over the meatloaf, then bake for an additional 15 minutes.
Remove from the oven, cover the meatloaf with aluminum foil or a plate, and let it rest for at least 10 minutes before slicing.
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Notes
Sauté the Vegetables First: Don’t skip cooking the onions and garlic before adding them to the ground meat—this step boosts both the flavor and moisture of your meatloaf.
Choose the Right Pan Size: A 5×5-inch baking dish is ideal, but a slightly larger one or even a small sheet pan works well. Leaving a bit of space around the meatloaf helps get those delicious caramelized edges.
Let It Rest: After baking, let the meatloaf rest for a few minutes under a loose cover of aluminum foil. This helps it firm up for easy slicing and keeps all the flavorful juices in.
To make a meatloaf for two, double the ingredients and use a larger baking dish. Extend the baking time to 40-45 minutes before adding the glaze. To ensure it's fully cooked, use a digital instant-read meat thermometer. The internal temperature should reach 165°F (74°C).