In a large bowl, whisk together the buttermilk, egg, hot sauce, pickle juice, paprika, salt, garlic powder, and onion powder until smooth. Add the chicken and coat well. Let rest for 30 minutes.
In another bowl, combine the flour, cornstarch, paprika, salt, garlic powder, onion powder, cayenne pepper, and white pepper.
Dredge each tender in the wet batter, coat in the dry mixture, dip back into the wet batter, and finish with another coating of the dry mixture.
Place coated tenders on a wire rack and let rest for 5 minutes.
Heat oil to 350°F and fry the chicken in batches for 8–10 minutes, turning occasionally, until deep golden brown and cooked through.
Transfer the fried chicken to a wire rack.
Whisk together the mayonnaise, ketchup, Worcestershire sauce, and Cajun seasoning until smooth. Refrigerate for at least 30 minutes before serving.
Serve hot with the dipping sauce, crinkle fries, and Texas toast.