Combine the cornstarch and water. Add it to the skillet along with the wine, lemon zest, lemon juice, salt and pepper.
Stir and cook on high heat for 1 minute.
Butterfly the chicken breasts (slice them horizontally, but not all the way through).
Place some of the sauce and Parmesan inside each chicken breast and place it in a baking dish. Cover the chicken with the remaining sauce and Parmesan.
Broil until lightly brown.
Recipe by The Gluten-Free Homemaker at http://glutenfreehomemaker.com/chicken-in-lemon-sauce/