Preheat the Oven:
Preheat your oven to 375°F (190°C).
Make the Honey Dijon Sauce:
In a small bowl, whisk together Dijon mustard, honey, olive oil, apple cider vinegar (or lemon juice), garlic powder, salt, and black pepper until well combined.
Prepare the Chicken:
Season the chicken breasts with salt and pepper on both sides. Place them in a baking dish or oven-safe pan.
Glaze the Chicken:
Pour the honey Dijon mixture over the chicken breasts, making sure they are evenly coated. If you prefer, you can use a basting brush to spread the glaze evenly.
Bake the Chicken:
Bake the chicken in the preheated oven for 25-30 minutes, or until the internal temperature reaches 165°F (74°C) and the chicken is golden and slightly caramelized. You can baste the chicken with the sauce halfway through cooking for extra flavor.
Serve:
Once done, remove the chicken from the oven and let it rest for a few minutes. Garnish with freshly chopped parsley, if desired, and serve with your favorite sides.