Marinate Chicken: Place the chicken breasts in a bowl and cover them with buttermilk. Let them marinate in the refrigerator for at least 1 hour, or overnight for best results.
Prepare Breading: In a shallow dish, mix together breadcrumbs, garlic powder, paprika, salt, and pepper.
Coat Chicken: Remove the chicken from the buttermilk, allowing the excess to drip off, then dredge each breast in the breadcrumb mixture until fully coated.
Fry Chicken: Heat oil in a large skillet over medium heat. Once hot, add the breaded chicken breasts and cook for about 5-7 minutes on each side, or until golden brown and cooked through. Remove from the skillet and allow to drain on paper towels.
Toast the Bread: In the same skillet, lightly toast the ciabatta bread until golden and crispy, about 1-2 minutes on each side.
Assemble Sandwiches: Spread a generous amount of Caesar dressing on the toasted ciabatta slices. Layer chopped romaine lettuce, a crispy chicken breast, and a sprinkle of Parmesan cheese on top.
Garnish & Serve: Add the second slice of ciabatta on top to close the sandwich. Garnish with chopped parsley if desired, and serve immediately while crispy.