Cut chicken breast fillets into strips. In a bowl, combine ginger garlic paste, vinegar, lemon juice, salt, white/black pepper powder, and buttermilk. Add chicken strips, coat well, and refrigerate for at least 1 hour (overnight for best results).
In a large bowl, mix all-purpose flour with thyme, basil, oregano, garlic salt, dried mustard, onion powder, ginger powder, black pepper, white pepper, paprika, cayenne pepper, and celery salt. Whisk together until evenly combined.
In a separate bowl, whisk egg whites with a pinch of salt until slightly frothy.
Remove chicken from the marinade, letting excess liquid drip off. Dredge each strip in the seasoned flour mix, dip into the egg wash, then coat again in the flour mixture for an extra crispy texture.
Heat oil in a deep fryer or heavy-bottomed skillet to 350°F (175°C). Fry chicken strips in batches for about 5–6 minutes or until golden brown and cooked through. Drain on a wire rack or paper towels.
Serve hot with your favorite dipping sauces like honey mustard, ranch, or KFC sauce. Enjoy crispy, flavorful homemade KFC-style chicken strips!