Prep the Ciabatta:
Cut the ciabatta in half lengthwise, then halve each half. Brush the cut sides with olive oil. Place in the oven at 200°C (top heat only) for about 10 minutes, until the inside is crispy.
Season the Chicken:
Drizzle the sliced chicken breast with olive oil and rub with salt, pepper, paprika, and garlic powder.
Bread the Chicken:
Coat each fillet in flour → egg → seasoned panko, pressing well.
Fry the Chicken:
Heat oil in a pan and fry each fillet until golden and crispy (about 3–4 minutes per side). Let drain on paper towels.
Make the Sauce:
Mix mayonnaise, mustard, Worcestershire sauce, lemon juice, Parmesan, salt, and pepper until smooth.
Prep the Lettuce:
Mix half of the sauce with chopped romaine lettuce.
Assemble the Sandwich:
Spread the remaining sauce on both sides of the toasted ciabatta. Layer with the sauced lettuce, crispy chicken, and a generous amount of Parmesan. Close the sandwich and serve immediately.