The kids are back and taking over the kitchen. Season Three of the hit cooking competition series MASTERCHEF JUNIOR returns Tuesday, Jan. 6 (8:00-9:00 PM ET/PT) on FOX. Host and award-winning chef Gordon Ramsay and fellow judges restaurateur Joe Bastianich and acclaimed chef Graham Elliot welcome 19 of the best junior home cooks in the country between the ages of 8 a…