01 - Preheat a grill pan or skillet over medium-high heat.
02 - Slice each chicken breast in half horizontally to create thinner cutlets. Drizzle with olive oil and season both sides with salt and pepper.
03 - Place chicken cutlets on the hot grill pan. Cook for 3 to 4 minutes per side until fully cooked, reaching an internal temperature of 165°F. Remove from heat and let rest for 2 minutes.
04 - Lightly toast the ciabatta rolls if desired for added texture and crunch.
05 - Spread a thin layer of pesto on the bottom half of each roll. Top with a grilled chicken cutlet, mozzarella slice, tomato slices, and a handful of arugula or spinach.
06 - Spread mayonnaise on the top half of the rolls, close the sandwiches, slice in half diagonally, and serve immediately.