<P> Grace gets a huge break when she is selected to be a contestant on MasterChef Junior Baking Edition, unaware that her grandmother submitted an application on her behalf . The prize for winning is $100,000, enough to save the bakery and replace the oven . Despite gamesmanship from one of her competitors, requiring her to improvise her signature dessert, Grace makes it into the finals of the competition . Reminded about the je ne sais quoi lesson from her uncle in developing her next dessert, Grace impresses the judges again and wins . </P> <P> Bernard, Sophie, Sylvie and Lily fly to Bentwick to congratulate Grace, surprising her even more when Bonbon appears . The community, having watched Grace on Masterchef Junior, comes to support the bakery, with Bernard giving business a boost for the celebration . </P> <Ul> <Li> Olivia Rodrigo as Grace Thomas, who is nine years old and loves baking . </Li> <Li> Virginia Madsen as Mrs. Thomas, Grace's mother who is an elementary school teacher . </Li> <Li> Eloise Webb as Sylvie, Grace's French cousin . </Li> <Li> Caitlin Carmichael as Maddy, Grace's best friend who loves art . </Li> <Li> Notlim Taylor as Ella, Grace's best friend who is a math whiz . </Li> <Li> Rafael Edholm as Mr. Thomas, Grace's father who is a therapist . </Li> <Li> Krisztina Peremartoni as Grace's grandmother, who co-owns a bakery with her grandfather . </Li> <Li> András Bálint as Grace's grandfather, who co-owns a bakery with her grandmother . </Li> <Li> Fabrice Michel as Bernard, Grace's uncle who owns a pâtisserie in Paris . </Li> <Li> Lili Bordán as Sophie, Grace's maternal aunt who moved to France to study baking and married Bernard . </Li> <Li> Roxane Bret (fr) as Colette, Bernard's pastry intern . </Li> <Li> Thierry Harcourt as Jean - Luc Pernaud, owner of a Paris hotel where Bernard seeks to expand his clientele . </Li> <Li> Joe Bastianich as himself, one of the judges on MasterChef Junior Baking Edition . </Li> <Li> Tom Doherty as Josh, Grace's older brother . </Li> <Li> Maxime Leigh - Wood as Carter, one of Grace's competitors on MasterChef Junior Baking Edition . </Li> </Ul> <Li> Olivia Rodrigo as Grace Thomas, who is nine years old and loves baking . </Li>

American girl grace stirs up success cast grace's brother