Meatball Sandwich

INGREDIENTS

• 1 pound ground beef
• 3/4 cup bread crumbs
• 2 teaspoons dried Italian seasoning
• 2 cloves garlic, minced
• 2 tablespoons chopped fresh parsley
• 2 tablespoons grated Parmesan cheese
• 1 egg, beaten
• 1 French baguette
• 1 tablespoon extra-virgin olive oil
• 1/2 teaspoon garlic powder
• 1 pinch salt, or to taste
• 1 (14 ounce) jar spaghetti sauce
• 4 slices provolone cheese