This is a quick and healthy recipe that can be easily personalized. It stared with as a baked dish without the salsa from a friend at a WW meeting. I added the salsa and then figured out how to cook in on the stove top. I tried baking it but the meat was either too dry or not cooked so I pan fry it instead. I sometimes add chopped mushrooms to the filling, or use a tomatillo salsa verde in place of the roasted tomato salsa. I am retired in Mexico, and filleted chicken is a staple. Basically what you are doing is slicing the chicken breast in half cross-wise and then slicing it partially in half again to create the thin fillet. If you are doing it yourself, try using a very sharp knife and a partially frozen chicken breast.