1 1/2 sticks (3/4 cup) salted butter, softened.
1/2 cup confectioner's sugar
2 large egg yolks
1 tsp vanilla extract
1 1/2 cups flour
1 cup any fruit jam
Preheat oven to 325 degrees.
In a medium bowl, cream butter with electric mixer at medium
speed. Add sugar and beat until smooth. Add egg yolks and
vanilla, and beat at medium speed until light and fluffy. Add the
flour and blend at low speed until thoroughly combined.