1. Preheat the oven to 210°C (410°F).
2. Bone the chicken and cut the meat into pieces.
3. Sauté the chicken pieces in a non-stick skillet over medium heat until lightly browned.
4. Transfer the chicken to mini oven-safe cocottes and bake for 20 minutes.
5. Meanwhile, wash the button mushrooms and slice them.
6. Sauté the mushrooms in the same skillet with a drizzle of olive oil until their water has evaporated. Sprinkle with chopped parsley, season with salt and pepper to taste, and mix well.
7. When the chicken is done, add the mushrooms to the mini cocottes. Cut the Mont d'Or cheese into pieces and place them on top.
8. Return to the oven and bake for another 20 minutes until the cheese is nicely browned.
9. Serve hot.