Preheat the camp oven, smoker, or closed gas grill to 375 degrees F (180 degrees C).
In a large bowl add the beef, cracker crumbs, milk, onions, pepperoni, Parmesan, eggs, salt, oregano, and pepper. Combine well but don’t over mix.
Press the mixture into the mini loaf pans. Cook for 30 minutes or until an internal temperature of 160 degrees F (61 degrees C) is reached. The carry-over cooking and additional steps will bring it over the recommended 165 degrees F (74 degrees C).
To Serve
Remove the mini meatloaves and place them on a foil-lined tray. Top with the pizza sauce and return to the heat for 10 minutes.
Remove the mini meatloaves and top with the mozzarella. Return to the heat and cook until melted and starting to brown. Serve hot.