Start by using a meat mallet to gently pound the chicken breasts to an even thickness, about ½ inch.
In a shallow dish, combine the all-purpose flour, ½ tablespoon of garlic powder, Italian seasoning, ½ tablespoon of kosher salt, and ½ tablespoon of fresh ground pepper.
In another dish, pour in the low-fat milk.
In a third dish, mix the Panko bread crumbs with the remaining garlic powder, Parmesan cheese, and the rest of the salt and pepper.
Coat each chicken cutlet in the flour mixture, shaking off the excess.
Dip the floured cutlet into the milk, allowing the excess to drip off, then dredge in the Panko mixture, pressing gently to adhere.
In a large frying pan, heat 4 tablespoons of olive oil over medium heat. Once hot, add the breaded chicken cutlets.
Cook for about 4-5 minutes on each side until golden brown and cooked through. Transfer to a paper towel-lined plate to drain excess oil.
In the same frying pan, add the remaining 2 tablespoons of olive oil and toss in the chopped broccoli rabe.
Sauté for about 3-4 minutes until tender and vibrant, seasoning with a pinch of salt and pepper.
In a small bowl, combine the mayonnaise and pesto, mixing thoroughly to create a creamy spread.
Slice the ciabatta bread in half and spread a generous layer of pesto mayo on both sides.
Layer on the crispy chicken cutlets, followed by sautéed broccoli rabe, slices of roasted red pepper, and provolone cheese.
If desired, grill the assembled sandwiches in a panini press or on a skillet until the cheese is melted and the bread is toasted.
Slice the sandwiches in half and serve immediately with your favorite sides.