Season the chicken breasts.
Slide the seasoned chicken together with butter into a vacuum-seal bag.
Seal the bag with a vacuum-sealer.
Preheat your sous-vide precision cooker to a temperature of 65 degrees. Allow the water bath to come to the right temperature before adding your chicken.
Cook for 2 hours.
Remove the chicken from the bag and heat a stainless steel skillet to medium-high heat.
Carefully add the chicken to the hot pan and fry for about 1 minute on each side.
Cut the chicken into 3 to 4 thick slices to make it easier to eat when serving.
Serve the chicken immediately garnished fresh herbs.