You can skip the chicken and just make the caponata. Throw it on some crostini and you have instant appetizers!
TIP: Calculate that you will need ½ a chicken breast for each open faced sandwich, and cook only what you need. Slice the bread into as many pieces as you want. Adjust the portion size of each sandwich to whatever you prefer. Also this dish can be vegetarian without the chicken and it will still taste amazing. Garnish with fresh basil.