""A cross between meatloaf and meatballs, this sandwich promises to hold together without being messy."..."
INGREDIENTS
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1 1/2 pounds lean ground beef
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1/3 cup Italian seasoned bread crumbs
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1/2 small onion, chopped
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1 teaspoon salt
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1/2 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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1/2 cup marinara sauce
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3 hoagie rolls, split lengthwise