Preheat oven to 400° F. Place a rack on top of a large rimmed baking sheet that has been lined with aluminum foil. Spray rack with cooking spray and set aside.
Pour salad dressing into a medium bowl.
In a large, shallow dish, combine bread crumbs, Corn Flakes crumbs, sugar, paprika, onion powder, garlic powder and salt. Drizzle with oil and mash with a fork until the oil is thoroughly incorporated (the crumbs will almost look like wet sand).
Pat the chicken dry; season with kosher salt and pepper.
Coat chicken pieces in Ranch salad dressing. I like a thin layer of the dressing, so I use a brush to coat the chicken. If it's easier, you can also just dip the chicken directly in the Ranch, then shake off any excess. Coat chicken with Corn Flakes mixture, pressing gently to help adhere.
Arrange chicken on prepared wire rack. Bake for about 40-50 minutes, or until chicken reaches an internal temperature of 165° F. Check the chicken after the first 20 minutes – if the breading starts to get too dark, tent loosely with foil for the remainder of the cooking time. If you're using bone-in chicken breasts, you will need to bake them for longer.