01 - Preheat oven to 350°F. Line a loaf pan with parchment paper or lightly grease it.
02 - In a large bowl, combine ground beef, ground pork, onion, garlic, eggs, breadcrumbs, milk, parsley, oregano, basil, salt, and pepper. Mix until just combined; avoid overmixing to keep the texture tender.
03 - Press half the meat mixture evenly into the bottom of the prepared loaf pan.
04 - Spread half the pizza sauce over the meat, sprinkle with half the mozzarella, and arrange half the pepperoni slices on top.
05 - Cover with the remaining meat mixture, pressing gently to form an even loaf shape and seal the edges.
06 - Spoon the remaining pizza sauce over the top, followed by the rest of the mozzarella and pepperoni. Finish with an even layer of grated Parmesan cheese.
07 - Bake for 50 to 55 minutes, or until the internal temperature reaches 160°F. For a golden, bubbly cheese top, broil for 2 to 3 minutes at the end.
08 - Let the meatloaf rest for 10 minutes before slicing to allow juices to redistribute. Serve warm with extra pizza sauce on the side if desired.