Preheat oven to 350°F and coat a large loaf pan with cooking spray.
In a large bowl, combine the ground beef, ground pork, bread crumbs, parmesan, garlic, Italian seasoning, salt, eggs and 1 cup of the marinara sauce.
1 pound ground beef, 1 pound ground pork, 2/3 cup plain bread crumbs, 1/2 cup grated parmesan, 1 teaspoon garlic powder, 1 teaspoon Italian seasoning, 1/2 teaspoon salt, 2 eggs, 1 1/3 cups marinara sauce
Cut off about 1/4 of the block of cheese and refrigerate until later. Cut the remaining piece into 1/2 inch cubes.
1 8-ounce block mozzarella cheese
Add the cubed cheese to the meat mixture and combine.
Add the mixture to a large loaf pan and bake in the preheated oven for 45-55 minutes, or until the internal temperature of the meatloaf is at least 150°F.
Then, spread the remaining 1/3 cup marinara sauce over the meatloaf and shred the remaining cheese over the top.
1 1/3 cups marinara sauce, 1 8-ounce block mozzarella cheese
Bake an additional 15 minutes, or until the internal temperature of the meatloaf is at least 160°F.
Remove from the oven, let it rest for 5-10 minutes then enjoy warm!