Preheat oven to 350° F. Spray 2 quart casserole with nonstick spray. Cook pasta and drain. Heat oil; add onion and pepper and cook, stirring for 1 minute. Add chicken, to-mato, pasta, artichoke, olives, seasoning and mix gently. Place half in casserole, top with half of cheese. Add remaining chicken mixture and top with remaining cheese. Bake 35 minutes.