Peel and finely dice the ginger and garlic. Puree both with the yogurt.
Season with a pinch of salt, black pepper and chilli flakes.
If necessary, parry the chicken breasts and place in a freezer bag. Pour in the marinade and mix everything well. Marinate the meat in the refrigerator overnight.
Take out the next day and place each chicken breast on a piece of aluminum foil. Season with fleur de sel and pepper. You can add a bit of the marinade.
Close the aluminum foil tightly in a package. To avoid soiling the oven, it is advisable to put the parcel on a plate.
Preheat the oven to 200 degrees and cook the parcels for 30-40 minutes (depending on the size of the chicken breasts). Open the package and cut the chicken breast into slices.