Start by grilling the chicken breast until it's cooked through.
Season the chicken with salt and pepper while grilling.
Prepare the vegetables: wash and slice the lettuce, tomato, and pickles.
Toast the bread slices lightly.
Let the chicken rest for a few minutes before slicing.
Spread mayonnaise or sauce on one side of each slice of bread.
Layer the lettuce on one slice of the bread.
Add the sliced chicken breast on top of the lettuce.
Follow with tomato slices, pickles, and cheese if using.
Top with the second slice of bread and press down gently.