Slice the whole wheat bread.
Wash the lettuce, tomato, and cucumber thoroughly and prepare them.
Cut the lettuce into bite-sized pieces.
Slice the tomato and cucumber thinly.
Place the lettuce, tomato, and cucumber on the sliced whole wheat bread.
Cut chicken breast or ham into bite-sized pieces and add them.
Add cheese.
Drizzle sauce (such as mustard or mayonnaise) according to your preference.
Cover with the remaining slice of whole wheat bread and cut in half.