INGREDIENTS
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4 8-ounce boneless, skinless chicken breasts
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1 1/4teaspoons salt
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3/4teaspoon freshly ground black pepper
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4tablespoons unsalted butter (1/2 stick)
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1cup sliced yellow onion (1 medium onion)
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1 sprig fresh thyme, plus 2 teaspoons fresh thyme leaves
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12ounces mushrooms such as shiitake or button, wiped clean, stemmed and sliced
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2teaspoons minced garlic (2 to 3 cloves)
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3tablespoons all-purpose flour
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3/4cup Marsala
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1 1/2cups homemade chicken stock or packaged low-sodium chicken broth
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Cooked penne pasta or other pasta for serving