INGREDIENTS
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2 tablespoons extra-virgin olive oil, divided • 1 pound boneless, skinless chicken breasts, trimmed and cut into 1-inch pieces •1/4 teaspoon salt, divided •1/4 teaspoon freshly ground pepper, divided, plus more to taste •1 pound mushrooms, sl
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•3 medium onions, chopped
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•3 tablespoons all-purpose flour
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•2 cloves garlic, finely chopped
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•1/2 cup Marsala, (see Tip)
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•1 1/2 cups reduced-sodium chicken broth
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•1 tablespoon balsamic vinegar