Cake Mix Cookies
["1/4 c. butter or margarine, softened", "1 (8 oz.) pkg. cream cheese, softened", "1 egg yolk", "1/4 tsp. vanilla", "1 pkg. cake mix (any flavor; some good ones are white, yellow, swirl or cherry chip)"]
["Cream butter and cheese.", "Blend in egg yolk and vanilla.", "Add dry cake mix 1/3 at a time, mixing well after each addition.", "(If mixer is used, add last 1/3 by hand.)", "Cover and chill 30 minutes."]
["butter", "cream cheese", "egg yolk", "vanilla", "cake mix"]