Hollow out the loaf of Italian bread using a serrated knife by making a shallow, diagonal cut all along the outside perimeter of the loaf. Pointed the tip of the knife towards the center of the loaf until the top of the loaf is cut free. Remove and set aside.
Layer slices of Havarti cheese into the bottom layer of the loaf. Sprinkle with garlic, Italian herbs, and parsley.
Toast bread in a toaster oven or oven at 425˚for about 3-5 minutes or until cheese is melted and bread has golden brown edges.
Toss together cooked spaghetti noodles with sauce and re-heat if needed using the mircrowave.
Layer hot spaghetti noodles on top of toasted bread. Top with spaghetti noodles, Parmesan cheese to taste and a sprinkle of dried parsley for garnish. Slice and serve warm.