Heat 1 teaspoons butter or olive oil in a small skillet. Add the onion and sauté over medium heat, stirring regularly, about 4 minutes or until browned.
Add the minced garlic and sauté 1 minute more, being careful not to burn.
In a large mixing bowl, combine ground beef, breadcrumbs, milk, eggs, sautéed onions and garlic, fresh parsley, worcestershire sauce, and seasonings. Use your hands to mix just until well-combined.
Transfer mixture to a rimmed baking sheet lined with parchment paper. Form into a loaf shape approximately 8 x 4 inches.
Bake at 350° for 40 minutes.
While meatloaf is baking, prepare the glaze by combining ingredients in a small bowl and mix well.
Remove meatloaf from oven, spread glaze over top and sides of loaf, and bake for an additional 20 minutes or until internal temperature reaches 160°F.