When all the pieces have been browned, return the chicken to the pan, placing it skin-side up, and sprinkle the shallots and rosemary over it. Place in the oven, uncovered, and roast for approximately 20 minutes, or until the juices run clear when you cut into a piece. Remove the skillet from the oven and, using tongs, transfer the cooked chicken to a serving platter; cover with foil to keep hot.