Cream Cheese Cookies
["1 (8 oz.) pkg. cream cheese, softened", "1/4 stick butter, softened", "1/4 tsp. vanilla", "1 egg yolk", "1 pkg. yellow or chocolate cake mix (do not use mix with pudding in it; lemon and raspberry cake mixes are wonderful)"]
["Chill dough 1/2 hour.", "Roll into balls (1/2 teaspoon).", "Bake at 375\u00b0 for 10 minutes."]
["cream cheese", "butter", "vanilla", "egg yolk", "chocolate cake"]