Cut down on the fat and dip it in just the egg before the cornflake mix. The butter is unnecessary, but you can drizzle a little over the breasts before you put them in the oven if you want. If the breasts are thick, cover for the first 15 minutes, then uncover for probably 10-15 minutes and check to see if it's done (the juices will run clear if you don't have a thermometer). You will cook it at a higher temp to begin with by doing it this way, and then they will get crispy after you uncover them. Put them on a rack or right in a glass or metal pan, I always spray mine with cooking spray for this dish. Cut the breasts into smaller pieces if you want a shorter cooking time.