Preheat the Oven: Set your oven to 375°F (190°C).
Prepare the Garlic Butter: Combine the melted butter, minced garlic, and Italian seasoning in a small bowl.
Prepare the Bread: Spread the garlic butter mixture evenly on the cut sides of the French bread loaf.
Bake the Bread: Place the bread halves on a baking sheet and bake them in the preheated oven for about 5 minutes, until slightly toasted.
Mix the Spaghetti: Toss the cooked spaghetti with marinara sauce in a separate bowl until well coated.
Assemble the Subs: Distribute the marinara-coated spaghetti evenly over each bread half.
Add the Cheese: Sprinkle shredded mozzarella cheese generously over the spaghetti on both bread halves.
Final Bake: Return the bread to the oven and bake for an additional 10 minutes, until the cheese is melted, bubbly, and golden brown.
Garnish and Serve: Remove from the oven, garnish with freshly chopped parsley if desired, slice into portions, and serve hot.
Prep Time: 10 mins | Cook Time: 15 mins | Total Time: 25 mins | Servings: 4
