01 - Preheat oven to 375°F. Line a baking sheet with parchment paper or lightly grease a loaf pan.
02 - In a large mixing bowl, combine ground beef, eggs, Parmesan cheese, milk, garlic, onion, parsley, breadcrumbs, salt, pepper, Italian herbs, and red pepper flakes. Mix gently until just combined—do not overmix.
03 - Shape the mixture into a loaf on the prepared baking sheet or press into a loaf pan.
04 - Spread the tomato sauce or ketchup evenly over the top, then sprinkle with the remaining Parmesan cheese.
05 - Bake for 50–55 minutes, or until the center reaches 160°F.
06 - Let the meatloaf rest for 10 minutes before slicing. Garnish with extra parsley and serve.