I am not a baker, but you really can’t screw up this recipe.
Preheat oven to 350 F (175 degrees C).
In a medium bowl, cream together the cream cheese and butter. Stir in the egg and vanilla. Add cake mix, and stir until well blended. Roll into 1" balls and then roll the balls in the powdered sugar. Place 1 inch apart onto an ungreased cookie sheet. Bake for 13 to 15 minutes. Remove from baking sheets to cool on wire racks.