Meatball Sandwich

Preheat the oven to 350 degrees F (175 degrees C).

Combine ground beef, bread crumbs, egg, Parmesan cheese, parsley, garlic, and Italian seasoning in a large bowl; mix with your hands until well combined. Shape mixture into 12 meatballs; place in a baking dish.

Bake in the preheated oven until meatballs cooked through, 15 to 20 minutes. An instant-read thermometer inserted into centers should read at least 160 degrees F (71 degrees C).

Meanwhile, cut baguette in half lengthwise; open like a book. Remove and discard some of the bread from the inside to make a well for the meatballs.

Brush baguette with olive oil; season with garlic powder and salt. Place baguette on a baking sheet, opened, oiled-sides up.

When meatballs have 5 minutes cooking time left, place baguette in the oven until lightly toasted.

Meanwhile, warm spaghetti sauce in a saucepan over medium heat.

Remove meatballs from the oven. Transfer meatballs to the sauce using a slotted spoon; stir gently to coat with sauce.

Spoon meatballs and sauce into one side of baguette, nestling meatballs in the well; top with provolone cheese.

Bake in the oven until cheese is melted, 2 to 3 minutes.

Cool slightly, then cut into 4 sandwiches.