1Preheat the oven to 375 degrees F (190 degrees C). Spray a broiler pan with cooking spray.
2Whisk buttermilk, 1 teaspoon taco seasoning, and cayenne pepper together in a bowl.
3Mix remaining taco seasoning, bread crumbs, Parmesan cheese, flour, onion powder, salt, and black pepper together in a separate bowl.
4Dip chicken in buttermilk mixture; coat with bread crumbs mixture. Place coated chicken in broiler pan.
5Bake in the preheated oven until chicken is longer pink in the center and coating is crispy, 30 to 35 minutes. An instant-read thermometer inserted into the center should read at least 165 degrees F (74 degrees C).