Begin by slicing the chicken breast in half lengthwise to create two even cutlets. This helps the chicken cook quickly and evenly. In a mixing bowl, whisk together the buttermilk and sriracha. Place the chicken in the buttermilk mixture and let it soak in the fridge for at least one hour. This will tenderize the meat and infuse it with flavor.
While the chicken marinates, combine all-purpose flour, dried thyme, mustard powder, onion powder, garlic powder, paprika, cayenne pepper, salt, and black pepper in another bowl. Stir until the spices are evenly mixed. This seasoned flour will form the crunchy outer layer of your burger.
Once marinated, take the chicken pieces out of the buttermilk, letting the excess drip off. Dredge them in the seasoned flour, then dip them back into the buttermilk once more. Finally, coat them again in the flour mixture. This double dredge process helps build that signature crispy coating.
Fill your heavy-duty pot with enough canola or corn oil to reach 2 inches up the side. Heat the oil to about 360°F. When hot, gently place the chicken into the oil—always away from you to avoid splatter. Fry each piece for 3 minutes per side, or until the internal temperature reaches 165°F. Once done, transfer to a rack or paper towel-lined plate.
Spread mayonnaise on the cut sides of each bun. Lay a crispy chicken piece on the bottom half, then top with shredded lettuce. Cover with the top bun and your delicious fried chicken burger is ready to enjoy. Want even more kick? Add a few drops of your favorite hot sauce on top!