Rinse chicken thighs and pat dry. Add to slow cooker.
In a small bowl or jar, combine dijon mustard, lemon juice, melted honey, salt, and pepper. Stir.
Pour sauce over chicken and give it a quick stir to coat chicken with sauce.
Allow to cook on high for approximately 5-6 hours (checking it after 3 hours in case your slow cooker cooks faster than mine) or until chicken has a golden brown color as seen in my photos.