Slice the chicken breast thinly.
Julienne the onion and tomato, and cut lettuce into bite-sized pieces.
Season the chicken breast with salt and pepper, then grill in a frying pan.
Warm the tortilla slightly in a pan.
Place chicken breast, lettuce, onion, tomato, and low-fat cheese on the tortilla.
Add a spoonful of low-fat yogurt or honey mustard sauce.
Roll up the tortilla and place it on a plate.