Preheat the oven to 375 degrees F (190 degrees C). Place a cooking rack inside a baking dish and spray both with cooking spray.

Combine flour, garlic powder, and pepper in a flat dish; stir until evenly combined. Stir mustard, honey, egg substitute, and hot sauce together in a small bowl.

Combine cornflake crumbs, bread crumbs, Parmesan cheese, onion flakes, garlic powder, pepper, paprika, onion powder, Italian seasoning, and cayenne pepper in another flat dish; stir until ingredients are evenly distributed.

Dip chicken tenders into the flour mixture until coated evenly, then dip into the egg mixture, shaking off any excess liquid. Drag the chicken through the bread crumb mixture, covering evenly.

Place chicken on the prepared cooking rack. Spray the chicken with cooking spray.

Bake in the preheated oven until chicken is no longer pink in the center and the juices run clear, about 25 minutes. An instant-read thermometer inserted into the center should read at least 165 degrees F (74 degrees C).