Source: Bon Appetit, March 1995
Heat 3 tablespoons olive oil in heavy large skillet over medium-high heat. Add chicken pieces to skillet and saute until brown, about 4 minutes per side. Transfer chicken to plate. Pour fat from skillet. Add remaining 3 tablespoons olive oil to skillet. Add halved mushrooms, diced green bell peppers, chopped onion, chopped garlic and oregano and saute until onion is tender, about 10 minutes. Mix in marinara sauce, chicken broth, Marsala and capers. Return chicken pieces to skillet, spooning sauce over. Bring sauce to boil. Reduce heat to medium-low. Cover skillet and simmmer until chicken is tender about 20 minutes.
Using tongs, transfer chicken to large platter. Boil sauce until slightly thickened, about 5 minutes; spoon off fat. Spoon sauce over chicken. Serve, passing Parmesan separately.