Chicken Marsala

1 3/4 cups reduced-sodium chicken broth (14 fl oz)
2 tablespoons finely chopped shallot
5 tablespoons unsalted butter
10 oz mushrooms, trimmed and thinly sliced
1 1/2 teaspoons finely chopped fresh sage
1/4 teaspoon salt
1/8 teaspoon black pepper
1 cup all-purpose flour
4 skinless boneless chicken breast halves (2 lb total)
2 tablespoons extra-virgin olive oil
1/2 cup plus 2 tablespoons dry Marsala wine
2/3 cup heavy cream
1 teaspoon fresh lemon juice

Put oven rack in middle position and preheat oven to 200°F.

Bring broth to a boil in a 2-quart saucepan over high heat, then boil, uncovered, until reduced to about 3/4 cup, about 20 minutes.

Cook shallot in 3 tablespoons butter in an 8- to 10-inch heavy skillet over moderate heat, stirring, until shallot begins to turn golden, about 1 minute. Add mushrooms, 1 teaspoon sage, salt, and pepper and cook, stirring occasionally, until liquid mushrooms give off is evaporated and mushrooms begin to brown, 6 to 8 minutes. Remove from heat.

Put flour in a wide shallow bowl.

/* This is where I change it, instead of using large filets ... */

Dice Chicken, sprinkle with salt and pepper, then coat with flour.

Heat 1 tablespoon each of oil and butter in a 10-inch heavy skillet over moderately high heat until foam subsides, then sauté half of chicken. until golden and just cooked through, about 4 minutes total. Transfer cooked chicken to a large heatproof platter, arranging in 1 layer, then put platter in oven to keep warm. Wipe out skillet with paper towels and cook remaining chicken in same manner, then transfer to oven, arranging in 1 layer.

Add 1/2 cup wine to skillet and boil over high heat, stirring and scraping up brown bits, about 30 seconds. Add reduced broth, cream, and mushrooms, then simmer, stirring occasionally, until sauce is slightly thickened, 6 to 8 minutes. Add lemon juice and remaining 2 tablespoons wine and 1/2 teaspoon sage.

Serve chicken with sauce and mashed potatoes.