Preheat the oven to 350 degrees. Pit and thinly slice the olives. Slice or chop the mushroom. In a small bowl, stir together the sliced olives, mushroom, goat cheese and thyme. Pat the chicken breasts dry. Season with sea salt and fresh pepper. Place each breast between 2 pieces of waxed paper and flatten. Spread the mixture evenly over each chicken breast, then roll up the breast with the stuffing. Lightly oil an ovenproof baking dish. Place the stuffed chicken breasts in the pan, cover with the sauce and bake until a meat thermometer measures 160 in the center. Remove from the oven and let sit for 5 minutes before serving. Makes 2 servings.