Preheat oven to 400°F. Line a rimmed baking sheet with aluminum foil or parchment paper for easy cleanup.
Lightly pound the chicken breasts to uniform thickness (about ½-inch). You can skip this step if you're starting with chicken cutlets (thinly-sliced chicken breast).
Pat the chicken completely dry with paper towels. Season liberally with salt on both sides. Sprinkle the cornstarch over both sides of the chicken and pat to coat evenly.
In a large, shallow dish, combine breadcrumbs, Corn Flake crumbs, sugar, paprika, onion powder, and salt. Drizzle with oil and mash with a fork until the oil is thoroughly incorporated and the mixture looks slightly clumpy.
Lightly beat the egg with a fork in another shallow dish.
Dip the chicken into the egg, letting excess drip off. Press firmly into the breading mixture until evenly coated on both sides. Discard any leftover mixture.
Place the chicken on the prepared baking sheet in a single layer, leaving space between pieces. Bake until the breading is deep golden brown and the meat reaches an internal temperature of 165°F, about 15 minutes.
Garnish with chopped fresh parsley and serve with lemon wedges.