Traditional Meatloaf

Name: Traditional Meatloaf
Ingredients: 1 medium yellow onion; 2 cloves garlic; 2/3 cup fine, dry breadcrumbs; 1/2 cup whole milk; 1/2 small bunch fresh parsley; 5 large sprigs fresh thyme, or 1 teaspoon dried thyme; 2 large eggs; 2 pounds 85% lean ground beef; 1/2 cup ketchup, divided; 2 tablespoons Worcestershire sauce, divided; 1 1/2 teaspoons kosher salt; 1 teaspoon freshly ground black pepper; 4 teaspoons packed light or dark brown sugar