Mix all the sauce ingredients in a small bowl, set aside.
Pound chicken breasts flat and season with salt and pepper.
Prepare three individual bowls: with flour, eggs, breadcrumbs.
Dip each chicken breast first in flour, then beaten egg and lastly into breadcrumbs. Make sure to coat chicken thoroughly, especially during last step.
Cook each chicken breast in a large skillet over medium to high heat for about 3-4 minutes on one side. Flip and place a slice of provolone cheese on top of the chicken and cook for another 3-4 minutes. The chicken should be crisp and golden brown on the outside.
When done cooking, place the chicken on a plate lined with paper towels to absorb the extra oil.
Toast the ciabatta rolls int he oven or skillet until crisp and dgolden brown (optional).
Proceed to assemble the chicken sandwiches. Spread a thick layer of the paprika sauce on each ciabatta roll cut side up and fill the sandwich with chicken, lettuce, tomato and onion.