Shortcut Tuna Casserole

1 box chicken flavored Rice-roni 1 can tuna 1/4 c. EACH: chopped celery, onions 1 packet cream of chicken 'cup of soup' Prepare Rice-roni according to box but adding an extra 1/2 c. water. Add tuna, onions, celery and soup packet. Cover pan and simmer 15-20 min. over low heat. Remove from pan and garnish with crushed potato chips.