1Heat oven to 375°F.
2In medium bowl, beat cream cheese and butter with spoon until well blended. Stir in vanilla and egg. Add cake mix; stir until well combined.
3Shape dough into 1-inch balls; roll in powdered sugar to coat. Place 1 inch apart on ungreased cookie sheets.
4Bake 11 to 15 minutes or until set. Remove from cookie sheets to cooling racks.