01 - Preheat the oven to 400°F. Lightly grease a baking dish with cooking spray or a thin layer of olive oil.
02 - In a mixing bowl, whisk together the Dijon mustard, whole grain mustard, honey, olive oil, minced garlic, smoked paprika, salt, and black pepper until smooth and well combined.
03 - Arrange the chicken breasts in the prepared baking dish. Pour the honey mustard sauce evenly over each piece, ensuring full coverage on all sides.
04 - Bake uncovered for 25–30 minutes, or until the chicken is cooked through and juices run clear. The internal temperature should reach 165°F when checked with a meat thermometer.
05 - For a golden, caramelized finish, switch the oven to broil and cook for an additional 2–3 minutes, watching closely to prevent burning.
06 - Remove from the oven, garnish with freshly chopped parsley, and serve immediately while hot.