01 - Preheat the oven to 400°F.
02 - Pat the chicken breasts dry and season both sides with salt and pepper.
03 - Heat olive oil in a large ovenproof skillet over medium-high heat. Sear the chicken breasts for 2–3 minutes on each side until golden. Remove from heat.
04 - In a bowl, whisk together both mustards, honey, hot sauce, Worcestershire sauce, tomato paste, vinegar, garlic, smoked paprika, and cayenne pepper until smooth.
05 - Pour the Diablo sauce evenly over the chicken in the skillet, making sure each breast is coated.
06 - Transfer the skillet to the oven and bake for 18–22 minutes, or until the chicken is cooked through (internal temp: 165°F).
07 - Remove from oven and let rest for 5 minutes. Spoon extra sauce over the chicken. Garnish with parsley and serve with lemon wedges, if desired.