Hearty Meatball Sandwich

By q

4.48 / 5

15min

1h 05min

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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