1. Preheat oven to 350 degrees F.
  2. Prepare your chicken cutlets by cutting off any excess fat or skin. Cut each prepared breast to half thickness (your knife should be moving parallel to your cutting surface). You should have 6 chicken cutlets, but you can cut to smaller pieces if desired.
  3. Place chicken cutlets in a casserole dish, being careful to have no overlapping chicken. Equal depth of the chicken is key, to ensure that everything is consistently cooked through.
  4. In a medium bowl, combine sour cream and cream of mushroom soup to make the gravy (for those less inclined towards sour cream, you can easily cut the sour cream in half or add an extra can of cream of mushroom, if you want a lot of gravy [I always do]). Combine thoroughly using a whisk.
  5. Scrape the white gravy on top of the chicken, making sure the chicken is fully and evenly covered. **If this does not need to be gluten-free, sprinkle the top of the dish with breadcrumbs, for a crunchy texture.
  6. Bake at 350 degrees F for 30 minutes.