3/4 c. butter
1/4 c. brown sugar, packed
1 egg yolk
1/2 pure vanilla
1 c. flour, plain
1/4 tsp. salt
1/2 c. nuts

Mix everything together and chill. Roll out into small balls and press your thumb in the center, bake for 10 to 12 minutes at 350 degrees. Place them on top rack. Cool. Fill centers with any flavor or preserves, jelly or icing in colors.