Heat a pan on medium-high heat and brush with olive oil.
Butterfly the chicken breast, then cut in quarters. Season with salt, pepper, and some Italian seasoning.
Cook for about 4 minutes on each side on the pan, or until the chicken is tender.
Cut a loaf of ciabatta into fours, then cut each quarter open. Spread an even amount of pesto on each piece of bread.
Place a piece of chicken on each of the bottom pieces of bread, then top with the red onion, kale, and tomato, sprinkle a bit more salt and pepper as needed.