1 lb. (4 pieces) boneless chicken breasts, skinned
1/3 c. cornstarch
1/8 c. vegetable oil
1 c. sliced green onions, including tops
1/4 lb. sliced fresh mushrooms
1 (10 oz.) pkg. artichoke hearts (optional), cooked according to pkg. directions
3/4 c. dry wine white or chicken broth
1/2 c. whipping cream
1 tsp. dried tarragon leaves
1/2 tsp. dried thyme leaves
Hot cooked rice
3 tomatoes, cut into wedges