Combine all ingredients in a large bowl, reserving 1 cup of the pizza sauce for later. Using hands or a wooden spoon, mix the ingredients until they are evenly combined.
Spray a baking pan (a sheet pan works well) with nonstick baking spray and shape a loaf roughly 4 inches tall and 12 inches long.
Pour half of the reserved sauce on top of the loaf, spreading over the top.
Bake in the preheated oven until browned and cooked through, 50-60 minutes. The meatloaf should register 160°F on an instant-read thermometer.
Remove from the oven and pour the rest of the pizza sauce over the loaf. If a pizza-style finish is desired, grate 4 ounces of mozzarella on top.
Allow to cool for 10-15 minutes. Then slice and serve.