Preheat the oven to 390F / 200C and if you do not have an oven-safe skillet, line a rimmed baking sheet with parchment paper.
Spoon the cottage cheese into a bowl, and stir in the diced fresh rosemary, thyme and parsley, salt and (optional) black pepper. Stir the cottage cheese and herbs to combine.
Slice a pocket into the chicken breasts so they are cut through about ¾ of the way, but not all the way through. Season each side of the chicken with salt, (optional) black pepper and dried thyme.
Spoon the cottage cheese mixture evenly between the chicken breasts into the pocket. I don't tend to do so, but you can use tooth picks to secure the stuffed chicken breasts if you like (make sure they are oven-safe).
Drizzle olive oil in your skillet and place the chicken breasts once the oil is hot and shimmering. Sear and cook the stuffed chicken for 3-4 minutes each side, so they are light golden brown.
If you have an oven-safe skillet, transfer to the oven. Or, alternatively, transfer the chicken breasts to a lined baking sheet. Cook for 20 minutes, or until the center of the chicken reaches 165F using a meat thermometer.
Allow the chicken to rest for 5 minutes, then plate up!