01 - Preheat the oven to 400°F. Lightly grease a 9x13-inch baking dish with olive oil or nonstick spray.
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 - Place the chicken breasts in the prepared baking dish. Pour the honey mustard sauce over the chicken, turning each piece to ensure an even coating on all sides.
04 - Bake uncovered for 25 to 30 minutes, or until the chicken reaches an internal temperature of 165°F and the juices run clear.
05 - For a golden, caramelized finish, switch the oven to broil for 2 to 3 minutes, watching carefully to prevent burning.
06 - Remove from the oven, garnish with chopped fresh parsley, and serve immediately while hot.