In a large skillet, melt butter over moderately low heat.
Season the pork chops with salt and ground pepper.
Raise heat to medium and add the pork chops to the pan. Sauté for about 7 minutes, turning occasionally, until browned and done to medium. Remove chops and keep warm.
Add chopped onion to the pan and cook, stirring, until soft, about 3 minutes. Pour in the chicken stock and bring to a boil. Reduce heat and simmer until reduced by half, about 2-3 minutes.
Stir in dijon mustard, chopped herbs, and pepper. Return pork chops to the pan to heat through.
Serve pork chops topped with the Dijon herb sauce.
Notes
Ensure pork chops are cooked to an internal temperature of 145°F for optimal juiciness.