Heat the oven to 400°F. Remove the bread from the bag. Carefully separate the bread halves with a fork. Place the 2 bread halves, cut-side up, onto a baking sheet.
Bake for 10 minutes or until the bread is heated through.
Heat the sauce and meatballs in a 2-quart saucepan over low heat. Cook and stir for 20 minutes or until the meatballs are heated through. Spoon the meatball mixture onto the bottom bread half. Top with the top bread half. Cut into quarters.
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