Cut the chicken breast into bite-sized pieces.
Season the chicken with salt, pepper, and paprika.
Heat olive oil in a pan and cook the chicken breasts over high heat.
Slice the ciabatta in half and toast it in a toaster.
Spread honey mustard sauce on the ciabatta.
Add the chicken, romaine lettuce, tomato, and onion.
Close the sandwich with the other piece of bread to complete.