Step 1: Preheat the Oven
Preheat your oven to 375°F (190°C) to ensure it’s ready to toast your garlic bread subs to perfection.

Step 2: Prepare the Garlic Butter
In a small bowl, mix the melted butter, minced garlic, and Italian seasoning. Stir until well combined. This mixture is what makes the bread irresistibly garlicky and flavorful.

Step 3: Toast the Bread
Place the halved French bread on a baking sheet, cut side up. Brush each half generously with the garlic butter mixture. Pop the bread into the preheated oven and bake for about 5-7 minutes, or until the bread is golden brown and crispy around the edges.

Step 4: Combine the Spaghetti and Sauce
While the bread is toasting, heat the cooked spaghetti with the marinara sauce in a skillet over medium heat. Stir to coat the spaghetti evenly with the sauce and cook for 2-3 minutes until warmed through.

Step 5: Assemble the Subs
Remove the toasted bread from the oven. Evenly distribute the sauced spaghetti on top of the garlic bread halves. Sprinkle the shredded mozzarella cheese generously over the spaghetti, ensuring full coverage. If you love extra cheese, feel free to add a bit more!

Step 6: Melt the Cheese
Return the assembled subs to the oven and bake for an additional 5-7 minutes, or until the cheese is fully melted and bubbling. You can also broil the subs for a couple of minutes for a golden, crispy top. Once done, remove from the oven and garnish with fresh parsley, if desired.

Step 7: Slice and Serve
Let the subs cool for a couple of minutes before slicing into individual portions. Now you’re ready to enjoy the ultimate spaghetti-stuffed garlic bread!