Hearty Meatball Sandwich

Hearty Meatball Sandwich was pinched from <a href="http://allrecipes.com/Recipe/Hearty-Meatball-Sandwich/Detail.aspx" target="_blank">allrecipes.com.</a>

""A cross between meatloaf and meatballs, this sandwich promises to hold together without being messy."..."

INGREDIENTS
1 1/2 pounds lean ground beef
1/3 cup Italian seasoned bread crumbs
1/2 small onion, chopped
1 teaspoon salt
1/2 cup shredded mozzarella cheese, divided
1 tablespoon cracked black pepper
1 teaspoon garlic powder
1/2 cup marinara sauce
3 hoagie rolls, split lengthwise
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