01 - Preheat your oven to 375°F. Line a baking sheet with parchment paper or lightly grease a loaf pan with cooking spray.
02 - In a large mixing bowl, combine ground beef, eggs, 1 cup Parmesan cheese, milk, garlic, onion, parsley, breadcrumbs, salt, pepper, Italian herbs, and red pepper flakes. Mix gently with clean hands or a spoon until just combined—avoid overmixing to prevent tough texture.
03 - Transfer the mixture to the prepared baking sheet and shape into an even loaf, approximately 9x5 inches, or press firmly into a loaf pan.
04 - Spread the tomato sauce or ketchup evenly over the top surface, then sprinkle with the remaining 1/3 cup Parmesan cheese.
05 - Bake for 50-55 minutes, or until the internal temperature reaches 160°F when measured with a meat thermometer inserted into the center.
06 - Let the meatloaf rest for 10 minutes before slicing to allow juices to redistribute. Garnish with additional fresh parsley and serve warm.