Mom's Thimble Cookies

1 cup butter

1/2 cup confectioner's sugar

4 egg yolks

1 tsp vanilla

2 cups flour

jam or jelly

Cream butter and sugar

Add yolks and vanilla until light and fluffy

Stir in flour.

Chill if necessary.

With floured hands, roll 1" balls.

Use a floured thimble to make a dent in the cookie.

Fill the dents with jam or jelly.

Bake at 325 for 25 minutes.