8 teaspoons (40g) Chinese five-spice powder, divided
4 teaspoons (20g) garlic powder, divided
3 red birdseye chilies, sliced
4 bone-in, skin-on chicken thighs
4 bone-in, skin-on chicken drumsticks
1 cup (128g) flour
½ cup (60g) cornstarch
¼ teaspoon (1g) cayenne pepper
1 teaspoon (5g) kosher salt
Canola oil for frying
Line two rimmed baking sheets with cooling racks and set aside.
Combine buttermilk, soy sauce, sesame oil, 2 tablespoons (30g) five-spice, 1 tablespoon (15g) garlic powder and sliced chilies in a large resealable bag; mix well. Add chicken and squeeze out as much air as possible. Seal the bag and place it in a large bowl. Refrigerate for 4 to 12 hours.
Whisk together remaining 2 teaspoons (10g) five-spice and 1 teaspoon (5g) garlic powder with flour, cornstarch, cayenne and kosher salt in a large bowl.
Remove chicken pieces from marinade and shake off any excess. Toss chicken into the flour mixture and place onto one of the rack-lined baking sheets. Set aside for 15 minutes. Heat 3-inches (8cm) of canola oil in a large heavy-bottomed Dutch oven or saucepan over medium-high heat to 350F (176C). Preheat the oven to 200F (93C).
Toss the chicken pieces into the flour mixture once again and set them back onto the rack-lined sheet.
Fry chicken, four pieces at a time for 12 to 14 minutes or until a thermometer reads 165F (74C), increasing or decreasing heat to maintain oil temperature of around 325F (163C). Place cooked chicken onto the clean rack-lined baking sheet and place in oven to keep warm while frying the remaining chicken.