1. To create the perfect Crispy Chicken Caesar Sandwich, we start by marinating the chicken. In a bowl, mix the egg, soy sauce, sesame oil, garlic, onion powder, salt, pepper, flour, and cornstarch. Coat the chicken thighs in this mixture and let them marinate for at least 20 minutes. This step helps to tenderize the meat and infuse it with a delightful blend of flavors.

2. Next, it’s time to whip up the signature Caesar dressing. Using a blender or food processor, combine the egg, olive oil, Parmesan, lemon juice, anchovy fillets, garlic, Dijon mustard, red apple vinegar, Worcestershire sauce, black pepper, and a pinch of salt. Blend until the mixture is smooth and creamy. This dressing is the backbone of the Crispy Chicken Caesar Sandwich, providing a tangy and irresistible flavor profile.

3. To add a delightful crunch to the sandwich, we’ll toast the panko breadcrumbs. In a pan over medium-low heat, melt the butter and then add the panko and a pinch of salt. Stir the mixture until the breadcrumbs are golden brown, about 3-4 minutes. These toasted panko bits will provide a satisfying texture when sprinkled over the salad.

4. Now, it’s time to fry the marinated chicken to perfection. Heat canola oil in a pot to 350°F. Carefully add the chicken thighs and fry them until they’re crispy and golden, about 8-10 minutes. Drain the chicken on a wire rack to allow the excess oil to drip off, ensuring a perfectly crisp exterior.

5. In a bowl, toss the chopped romaine lettuce with the Caesar dressing, toasted panko breadcrumbs, and shaved Parmesan cheese. Spread a generous amount of the extra dressing on the bottom halves of the toasted croissants. Place the crispy fried chicken on each croissant, then top with the dressed salad mixture and an extra sprinkle of Parmesan. Close the sandwiches with the croissant tops and serve immediately for maximum flavor and texture.