This was originally posted by Virginia Sauer and is wonderful.

~- Preheat oven to 350 degrees F.

~- In large mixing bowl, cream butter until it is fluffy and white. (This will usually take about 15 minutes if using an electric mixter, or 45 with a wooden spoon.)

~- Gradually add 1/3 cup powdered sugar. Continue beating until mixture is soft and fluffy.

~- Add egg yolk and cognac. Continue beating until thoroughly blended.

~- Gradually add flour, stirring with wooden spoon to yield soft, buttery dough.

~- Knead gently with your hands until smooth (5 - 8 minutes).

~- Roll dough between palms of hands walnut-sized balls.

~- Arrange close together on ungreased cookie sheets.

~- Place pan on center shelf of oven.

~- Bake until golden (12 - 15 minutes).

~- Gently transfer to wire rack with spatula.

~- Sprinkle with powdered sugar.

~- When cool, roll cookies in powdered sugar until evenly coated.

Nb: These are very fragile.