Preheat the oven to 375°F. Prepare a baking sheet or a 9×5-inch loaf pan by lining it with aluminum foil and coating it with a light layer of nonstick spray. Set aside.
In a large mixing bowl, combine the ground turkey, panko breadcrumbs, milk, eggs, parsley, Worcestershire sauce, ketchup, salt, black pepper, garlic powder, and onion powder. Stir just until incorporated to maintain a tender texture.
Shape the blended mixture into a loaf and position it on the prepared baking sheet.
In a separate small bowl, blend together the ketchup (or BBQ sauce) with the brown sugar. Spread the sauce evenly over the top of the meatloaf. For additional flavor, freshly ground pepper can be sprinkled on top.
Bake in the preheated oven for 45 to 55 minutes, or until the internal temperature reaches 160°F. Once done, let the meatloaf rest for 5 to 10 minutes before slicing into 8 to 10 pieces.