Preheat the oven to 375°F (190°C).
In a small bowl, whisk together the maple syrup, Dijon mustard, soy sauce, and olive oil.
Season the chicken breasts with salt and pepper, then place them in a baking dish.
Pour the maple mustard mixture over the chicken, ensuring each piece is coated.
Bake uncovered for 30-35 minutes, or until the chicken reaches an internal temperature of 165°F (74°C).
Garnish with fresh thyme before serving, if desired.