Gooey Butter Cookies

These are SO good! 1 box Duncan Hines Butter Recipe cake mix 1 stick butter 1/4 tsp. vanilla 1 pkg. cream cheese (room temperature) 1 egg Combine all ingredients with electric mixer until well blended. Chill dough for 2 hours. Preheat oven to 350 degrees. Roll dough into balls about the size of walnuts. Roll balls in powdered sugar. Bake on ungreased cookie sheet 10-12 minutes. Cool completely. Dust cookies with powdered sugar when completely cooled.