How many movies have Jim Cummings and Rossen Varbanov collaborated on?

They have worked on 4 movies together! Their first movie together was Mickey's Once Upon a Christmas (1999) while their highest rated movie together was Mickey Mouse Clubhouse: Choo-Choo Express (2009). They have not worked together since Mickey Mouse Clubhouse: A Goofy Fairy Tale (2016). They are most known for their animation films together.