For which film did Charlie Kaufman win his first Oscar for best manuscript?

Explanation

Charlie Kaufman had only written manuscripts for tv series before his 1999 film break-through with the film 'Being John Malkovich', starring John Cusack. He only won his first Oscar in 2004, however, for best manuscript for the film 'Eternal Sunshine of the Spotless Mind'. In 2008, he debuted as a director with the film 'Synechdoche, New York'. Charlie Kaufman tends to cast the actress Catherine Keener, who has played in three of his films.