Omit the chicken for a vegetarian version.
Half an iceberg lettuce, shredded
a handful of chopped cooked chicken breast
a bottle of caesar salad dressing, coat the lettuce to your desired amount (I used one from Marks and Spencer)
a packet of croutons (really lovely ones from Marks and Spencer)
Shavings of parmesan
Just mix everything together, top with some more shavings of parmesan and freshly ground black pepper.