Pat the chicken tenders dry with the paper towels.
In a large bowl, toss the chicken with the garlic powder, onion powder, kosher salt, pepper, and flour until lightly coated.
Add the egg and buttermilk to the bowl, stir to submerge all tenders. Cover and refrigerate for 2-3 hours or overnight.
Mix all the sauce ingredients in a small bowl until smooth. Cover and refrigerate.
In a large shallow dish, whisk together all the coating ingredients for 1 minute until uniform.
Remove a tender from the marinade, letting excess drip off.
Dredge thoroughly in the coating mixture, pressing firmly for complete coverage.
Quickly dip back in the buttermilk marinade, then immediately dredge again in the flour mixture, pressing to create a thick crust.
Place on a wire rack. Repeat with remaining tenders.
Let the coated tenders rest for 15 minutes until coating becomes paste-like.
Heat 3 inches of peanut oil to 360°F in a large heavy pot.
Fry in batches of 4-5 tenders for 7-9 minutes, turning occasionally, until deep golden brown and internal temp reaches 165°F.
Transfer to a wire rack to drain and immediately sprinkle with salt.
Let rest 2-3 minutes before serving with the chilled sauce.