Cream butter, sugar, and cream cheese. Add vanilla and egg yolk; mix. Add flour and blend. Chill dough.
Shape into 1 inch balls. Using floured thimble, press hole in center of each cookie. Fill each with 1/4 tsp. strawberry jam.
In a 350 degree pre-heated oven, bake for 10-12 minutes on an ungreased cookie sheet.
Yields: 5 dozen cookies
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