INGREDIENTS
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1 1/2 pounds boneless skinless chicken breasts, each breast cut crosswise into 3 pieces
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Salt and freshly ground black pepper
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2 tablespoons olive oil
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5 tablespoons butter, divided
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3/4 cup chopped onion
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1 pound cremini mushrooms, sliced
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2 tablespoons minced garlic
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1 cup dry Marsala wine
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1 cup (8 ounces) mascarpone cheese
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2 tablespoons Dijon mustard
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2 tablespoons chopped fresh Italian parsley leaves, plus whole sprigs, for garnish
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12 ounces dried fettuccine