Place chicken breasts between two sheets of plastic wrap; pound to an even thickness. Cut each breast in half. Lightly dust with flour.
Heat olive oil in a heavy bottom pan or Dutch oven. Brown chicken pieces on each side. Remove. Add eggplant, mushrooms, onion, garlic and seasonings to pan; cook for 5 minutes, stirring occasionally.
Return chicken to pan. Stir in chicken broth, sherry, salt & pepper. Simmer covered for about 1 hour or until chicken is done and juices run clear. Add in artichokes during last 20-minutes of cooking.
Combine citrus herb gremolata ingredients. To serve, top hot cooked pappardelle pasta with stew. Generously sprinkle gremolata on top.