Cream Cheese 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, yellow or chocolate"]
["Cream butter and cheese.", "Blend in egg yolk and vanilla.", "Add dry cake mix, 1/3 at a time, mixing well each time.", "Cover and chill for 30 minutes."]
["butter", "cream cheese", "egg yolk", "vanilla", "cake mix"]