Preheat your oven to 350°F (175°C) and line a baking sheet with aluminum foil, spraying it with nonstick cooking spray.

In a skillet, heat olive oil over medium heat and sauté diced yellow onion for 5-7 minutes until tender and slightly browned.

In a mixing bowl, combine ground beef, sautéed onions, bread crumbs, eggs, whole milk, salt, black pepper, onion powder, garlic powder, Italian seasoning, half the ketchup, Worcestershire sauce, and chopped parsley.

Shape the meat mixture into a loaf and place it on the prepared baking sheet.

Mix the remaining ketchup with brown sugar to prepare the glaze.

Spread the glaze over the meatloaf and bake for 45 minutes to 1 hour until the internal temperature reaches 160°F (71°C).

Let the meatloaf rest for 10-15 minutes before slicing and garnish with parsley.