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