INGREDIENTS
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1 tablespoon unsalted butter
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1/2 yellow onion, diced
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1 tablespoon flour
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3/4 cup low-sodium chicken broth
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1 10-ounce box frozen peas and carrots
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1 3- to 4-pound store-bought rotisserie chicken, meat shredded
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1/4 teaspoon kosher salt
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1/4 teaspoon black pepper
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2 refrigerated 9-inch piecrusts (from a 15-ounce package, such as Pillsbury)