In a large bowl whisk together the lemon zest, lemon juice, olive oil, dijon mustard, soy sauce, brown sugar, salt and pepper. Toss the chicken thighs in the marinade so that they are evenly coated.
Cover the bowl and place in the fridge to marinate for at least 2 hours, but no more than 6 hours.
When you are ready to bake, Preheat oven to 400F. pPlace a wire rack on a sheet pan with a piece of foil or parchment under the rack. Spray the rack with cooking oil. If you don’t have a rack you can bake directly on parchment on the sheet pan.
Place marinated chicken thighs on the wire rack and brush the extra marinade that is in the bowl over top of the chicken thighs. Place sheet pan in the oven at 400F for 22-25 mins.
Cook until the chicken reaches an internal temperature of 165F.
Allow the chicken to rest for 5-10 minutes before cutting.