01 - Pound chicken breasts between plastic wrap to 1/2-inch thickness using a meat mallet for even cooking.
02 - Whisk buttermilk and hot sauce in a large bowl. Add chicken, coat thoroughly, cover and refrigerate for at least 1 hour or overnight.
03 - Combine flour, cornstarch, paprika, garlic powder, onion powder, salt, black pepper, cayenne, and thyme in a shallow dish.
04 - Whisk eggs and milk together in a separate bowl until fully combined.
05 - Remove chicken from buttermilk, letting excess drip off. Dredge in seasoned flour, dip in egg wash, then dredge again in flour, pressing lightly to adhere coating.
06 - Heat vegetable oil in a deep skillet or Dutch oven to 350°F.
07 - Fry chicken in batches without overcrowding for 5–7 minutes per side until golden brown and internal temperature reaches 165°F.
08 - Transfer to a wire rack or paper towels to drain. Let rest for 5 minutes before serving.