Add the corn flakes, parmesan cheese, salt, garlic powder, and onion powder to a food processor and pulse until they resemble breadcrumbs.
Using three shallow dishes, put the flour in one, the eggs (whisked) in the second, and the rest of the ingredients in the third.
Cut the chicken breasts into nugget-sized pieces.
Using one hand for the "dry" dishes and one for the "wet" dish, place the chicken nuggets through the three dishes: first flour, then eggs, then the cornflake mixture, coating all sides.
Place on a baking pan until you've done the process to all the chicken.
Bake at 425 for 15 minutes.
If freezing, flash freeze them on a pan for a few hours, then place in a ziptop bag or freezer safe container. Reheat them the same way you cook them fresh!
Reheat the same way you cooked them. (You can also reheat in the microwave, but they won't be as crispy.)