Prepare Comté cheese: Grate the Comté cheese yourself for better flavor.
Brown the chicken: Make the chicken thighs presentable and brown them in a frying pan or sauté pan with butter and oil over high heat, then lower the heat.
Season and deglaze: Add mustard seeds, season with salt, pepper, and paprika. After a minute, deglaze with white wine or lemon juice and wait for it to evaporate.
Simmer the chicken: Add chicken stock, a clove of garlic, and a sprig of rosemary. Cover and let it simmer for 3 to 4 hours.
Prepare potatoes: In the meantime, peel some potatoes and boil them.
Grate the sauce: Once the chicken is cooked, remove it to mix the sauce with cream, Dijon mustard, and 3/4 of the grated Comté.
Bake: Put the chicken thighs back in the sauce, accompanied by the potatoes. Cover with the rest of the Comté and bake in an oven preheated to 180°C (356°F) for 10 to 15 minutes. Optionally, add a grill finish.
Garnish and serve: Garnish with chives or parsley before serving.