MasterChef Junior is an American cooking competition television series that is airing on Fox. It premiered on Friday, September 27, 2013.It is based on the format of the U.K. series Junior MasterChef.On March 5, 2014, MasterChef Junior was renewed for a third season before production on season two began.The second season premiered on November 4, 2014.The third season premiered on January 6, 2015.The fourth season premiered on November 6, 2015. The fifth season premiered on February 9, 2017.