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, being careful not to overwork the meat.
03 - Press half of the meat mixture evenly into the bottom of the prepared loaf pan.
04 - Spread half the pizza sauce over the meat layer. Sprinkle with half the mozzarella and arrange half the pepperoni slices on top.
05 - Cover with the remaining meat mixture, pressing gently to shape into an even loaf.
06 - Spoon the remaining pizza sauce over the top of the loaf. Layer the rest of the mozzarella and pepperoni on top, then finish with a generous sprinkling of 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 an additional 2 to 3 minutes.
08 - Remove from the oven and let the meatloaf rest for 10 minutes before slicing. Serve warm with extra pizza sauce on the side if desired.