Got leftover roast chicken, but don't have time to make chicken enchiladas? Then throw together this scrumptious chicken sandwich. Layers of succulent chicken meat, mashed avocado, and melted cheese combine to make a simple but satisfying sandwich. The secret ingredient is a quick homemade Russian dressing; it provides a rich creaminess that ensures the sandwich isn't too dry. Although the recipe calls for whole-wheat bread, feel free to use whatever bread you have on hand, just be sure it's toasted! Learn the uncomplicated method after the jump.