Season the the chicken with the Cajun, salt and pepper. Cook in a non stick frying pan for 5 minutes, then turn and cook for about 4 minutes until cooked through but still moist and juicy. Now squeeze over a little lemon juice.
While the chicken is cooking, mash together the blue cheese and the mayonnaise.
Layer the salad ingredients on top of the slices of bread and top with moist chicken, followed by the blue cheese mayo. Sandwich together and eat warm.