Cut the chicken breast into bite-sized pieces.
Heat olive oil in a pan and cook the chicken breast until golden brown.
Mix the hot spicy sauce evenly with the chicken breast.
Cut the ciabatta bread in half and lightly toast it in a pan.
Place the chicken breast, lettuce, tomato, and onion on the ciabatta.
Add your desired sauce (such as mayonnaise) and cover with the other half of the bread.