Spray cooking oil in a 9 x 5 x 3-inch loaf pan. Preheat the oven to 375F.
In a large bowl, combine meats, egg, and breadcrumbs until barely blended.
Puree tomatoes in a food processor.
Add half of the tomatoes to the meat mixture. Then, add diced onion, minced garlic, diced pepper, basil, oregano, salt, pepper, and shredded cheese to the meat mixture. Mix until barely blended.
Put meat mixture into the loaf pan. Bake for 1 hour.
Top with remaining tomatoes. Bake for another 15-20 minutes, or until the internal temperature is about 155F.
Allow the meatloaf to rest for about 5 minutes, slice, and serve.