This recipe is from "Martha Stewart's Cooking School."
Dredge chicken: Spread flour in a shallow dish; add 3/4 teaspoon salt and 1/4 teaspoon pepper and whisk to combine. Place chicken in seasoned flour, turning to coat thoroughly, then tap off excess.
Saute chicken: Heat the oil and 1 tablespoon butter in a large skillet over medium-high heat until butter starts to sizzle. Cook the chicken in batches, if necessary, to avoid crowding the pan (the cutlets should fit snugly in a single layer) until golden and cooked through, 2 to 3 minutes for each side. The cooking time will depend on the thickness of the cutlet. Transfer the chicken to a platter. Pour out any excess fat from the pan.
Deglaze pan and make sauce: Return pan to medium heat and add wine, scraping up any browned bits from the bottom of the pan with a wooden spoon. Cook until the liquid is reduced by half, about 30 seconds. (If the liquid is reducing too quickly -- before all the browned bits have been incorporated -- take the pan off the heat.) Remove pan from heat. Add lemon juice, capers, and remaining 2 tablespoons butter and swirl until melted and combined, then add parsley and season with salt as desired.
Serve: Immediately pour the sauce over the chicken, and serve.