INGREDIENTS
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1 (12-ounce) flank steak, trimmed
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1/4 teaspoon kosher salt
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1/4 teaspoon freshly ground black pepper
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2 teaspoons extra-virgin olive oil, divided
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1 cup thinly sliced onion
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2 (5-inch) portobello mushroom caps, sliced
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1 1/2 cups thinly sliced green bell pepper
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2 teaspoons minced garlic
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1/2 teaspoon Worcestershire sauce
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1/2 teaspoon lower-sodium soy sauce
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2 teaspoons all-purpose flour
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1/2 cup 1% low-fat milk
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1 ounce provolone cheese (about 1/4 cup), torn into small pieces
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2 tablespoons grated fresh Parmigiano-Reggiano cheese
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1/4 teaspoon dry mustard
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4 (3-ounce) hoagie rolls, toasted