01 - Place chicken breast halves between two sheets of plastic wrap and pound to 1/2-inch thickness. Season both sides with salt and pepper.
02 - Dredge chicken in flour, shaking off excess.
03 - Heat olive oil and 2 tablespoons butter in a large skillet over medium-high heat.
04 - Add chicken and cook 3-4 minutes per side, until golden and just cooked through. Transfer to a plate and tent with foil.
05 - Pour off excess fat from skillet. Add wine (or broth), scraping up browned bits, and simmer for 2 minutes.
06 - Add lemon juice, capers, and 1/3 cup broth. Simmer for 3 minutes.
07 - Return chicken to skillet and simmer in sauce for 2 minutes, turning once.
08 - Remove from heat. Stir in remaining 2 tablespoons butter and parsley. Serve chicken with sauce spooned over the top.