Preheat the oven to 400F and line a baking sheet with aluminum foil or parchment paper and then add a wire rack on top.
Crush up the cornflakes using a food processor or by putting them in a ziplock bag and manually crushing them. Add to a bowl
Cut each breast vertically into 4-5 equal strips. They will look smallish now, but will spread out later once you push them into the cornflake mixture.
Add all of the seasoning together, and add half off the seasoning to the flour in a medium sized bowl and add the other half to the cornflake mixture in a different medium sized bowl.
Combine the egg and milk in a bowl and mix well so that the egg is completely mixed in. Add an additional 1/2 tsp of salt and 1/4 tsp of black pepper to the egg mixture.
Push down each chicken strip in the flour mixture. Push down gently on the sides all the way down and it will spread out and become bigger. Then, take the chicken strip and dip it in the egg mixture, and finally add it to the cornflake mixture, push down on it gently and coat it.
Add each piece of chicken to a wire rack on a baking sheet. When you add your chicken on to the wire rack, it will ensure that air gets circulated underneath each piece of chicken and make the cornflakes crunchy. Repeat with remaining pieces of chicken and then spray them with oil spray.
Bake for 20 minutes