Cook pasta according to package directions. , Meanwhile, in a large ovenproof skillet, melt butter over medium-high heat. Add onion; cook and stir until tender. Stir in flour until blended; gradually add broth. Bring to a boil; cook and stir for 2 minutes or until thickened. Stir in the chicken, artichoke hearts, cheese, tomatoes and olives. , Drain pasta; stir into the pan. Broil 3-4 in. from the heat for 5-7 minutes or until bubbly and golden brown. Sprinkle with parsley.