Cream Cheese Cookies

This is a recipe that I got from my MIL who received it from an old friend. I make it mostly at christmas time with all my other goodies. I had all the ingredients on hand so I whipped them up for an after-school snack for my boys. They were more than happy to eat them!
Cream Cheese Cookies
submitted by Michelle

8oz pkg. cream cheese
1/4 cup butter or margarine
1 egg yolk
1/4 tsp. vanilla
1 pkg. yellow cake mix

Cream butter and cream cheese. Blend in egg yolk and vanilla. Add cake mix 1/3 at a time; mix well adding last 1/3 by hand. Chill dough for 1/2 hour. Drop by scant rounded tsp. on ungreased baking sheet. Bake 8-10 minutes at 375 degree's until delicately browned. Cool slightly before removing from baking sheet.