Prepare 2 slices of whole wheat bread.
Boil chicken breast and shred it into bite-sized pieces.
Thinly slice cucumber and lettuce.
Lightly grill the chicken breast in a pan without oil to remove excess moisture.
Place lettuce, chicken breast, cucumber, and tomato on top of a slice of bread.
Drizzle with low-fat yogurt dressing.
Cover with the other slice of bread to complete the sandwich.