Which Pixar film features a rat who wants to be a chef?

Which studio produced 'Shrek' (2001)? Which film was the first to win the Academy Award for Best Animated Feature? Which Studio Ghibli film won the Academy Award for Best Animated Feature in 2003? Who directed 'Spirited Away'? Which Pixar film features a robot that cleans up an abandoned Earth? In which Pixar film does an old man tie balloons to his house? Which Pixar film is set around the Mexican holiday Día de los Muertos? Which Disney film features the song "Let It Go"?