INGREDIENTS
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1 medium Vidalia or other sweet onion, peeled and thinly sliced
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Cooking spray
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2 teaspoons salt-free onion and herb seasoning blend, divided
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1/2 cup plus 2 tablespoons water
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1 cup fat-free, less-sodium beef broth
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12 ounces very thinly sliced low-sodium deli roast beef (such as Boar's Head)
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4 (2 1/2-ounce) hoagie rolls, split lengthwise
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4 (0.8-ounce) slices reduced-fat Swiss cheese, torn in half