Hearty Meatball Sandwich

Details

Ingredients

• 1 ½ pounds lean ground beef
• ⅓ cup Italian seasoned bread crumbs
• ½ small onion, chopped
• 1 teaspoon salt
• ½ cup shredded mozzarella cheese, divided
• 1 tablespoon cracked black pepper
• 1 teaspoon garlic powder
• ½ cup marinara sauce
• 3 hoagie rolls, split lengthwise