01 - Slice each chicken breast in half horizontally to create 4 thin fillets for even cooking.
02 - Whisk buttermilk, garlic powder, onion powder, salt, and pepper in a bowl. Submerge chicken pieces and marinate for at least 15 minutes, up to 4 hours refrigerated.
03 - Arrange three shallow bowls: one with flour, one with beaten eggs, and one with panko mixed with grated Parmesan cheese.
04 - Remove chicken from marinade. Dredge each piece in flour, dip in egg wash, then press firmly into panko-Parmesan mixture for complete coverage.
05 - Heat ½ inch vegetable oil in a large skillet over medium-high heat. Fry chicken pieces 3–4 minutes per side until golden brown and internal temperature reaches 165°F. Drain on paper towels.
06 - Lightly toast buns in skillet or toaster until golden.
07 - Spread Caesar dressing on bottom buns. Layer with shredded romaine, crispy chicken fillet, additional dressing, and shaved Parmesan. Season with fresh black pepper.
08 - Top with remaining bun halves and serve immediately while chicken remains crispy.