Preheat your oven to 425°F (220°C) and lightly grease a baking dish with olive oil.
In a small bowl, whisk together the maple syrup, Dijon mustard, olive oil, minced garlic, fresh rosemary, salt, and pepper until well combined.
Place the chicken breasts in the prepared baking dish and pour the maple Dijon mixture over the chicken, ensuring each piece is thoroughly coated.
Let the chicken marinate for 15-20 minutes if time permits, to enhance the flavor.
Bake in the preheated oven for 20-25 minutes, or until the chicken is cooked through and reaches an internal temperature of 165°F (75°C). Baste with the sauce halfway through cooking for extra flavor.
Once done, remove the chicken from the oven and let it rest for about 5 minutes before slicing.
Garnish with freshly chopped parsley if desired before serving.