"Want to take it over the top? Go for a side of mashed potatoes...."
INGREDIENTS
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2 pounds boneless, skinless chicken breasts (about 4)
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1 1/2 teaspoons kosher salt, divided
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1/4 teaspoon freshly ground black pepper
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2 tablespoons olive oil
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2 tablespoons unsalted butter
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8 ounces sliced cremini mushrooms
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2 tablespoons all-purpose flour
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1 cup half-and-half or whole milk
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1/2 cup low-sodium chicken broth
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2 tablespoons balsamic vinegar