Preheat oven to 350 degrees
In a large bowl mash together the bread and milk until it forms a paste.
Next add in the ground turkey, Italian sausage, eggs, breadcrumbs, grated parmesan/romano cheese, Italian seasoning, onion powder, granulated garlic, salt, pepper, ½ cup of the shredded mozzarella and provolone cheese, and 1 cup of the marinara sauce.
Mix all of the ingredients, using your hands, until everything is evenly distributed.
Spray a 7 x 11 or 9 x 11 baking dish with cooking spray. Place the meat mixture into the dish and form into a loaf.
Spread the remaining marinara sauce over the meatloaf.
Bake for 75 minutes.
Set oven to broil.
Sprinkle the rest of the shredded cheese over top and broil for 2-3 minutes or until the cheese is melted.
Remove meatloaf from the oven, let it sit for about 5 minutes, and then serve.