Preheat the oven to 375°F (190°C) and line a baking sheet or loaf pan with parchment paper.

In a large bowl, gently combine the ground beef, breadcrumbs, parsley, 1/4 cup of the ketchup, eggs, diced onion, garlic powder, salt, and black pepper. Mix just until combined; do not overmix to keep the meat tender.

Transfer the mixture to the prepared pan and shape it into a 9x5-inch loaf.

Spread the remaining 1/4 cup of ketchup evenly over the top of the loaf.

Bake for 55 to 65 minutes, or until the internal temperature reaches 160°F. Let rest for 10 minutes before slicing and serving.