Season the chicken breast with salt and pepper.
Heat oil in a pan and cook the chicken breast on both sides.
Let the chicken breast cool, then slice it into bite-sized pieces.
Cut rye bread or whole wheat bread in half.
Spread mustard sauce on the bread.
Add chicory, lettuce, and other vegetables.
Place the sliced chicken breast and cranberries on the bread.
Cover with the other half of the bread to complete the sandwich.