Using the paddle attachment, cream the butter and sugar until creamy and fluffy. This may take up to 5 minutes.
¾ cup Butter, ½ cup Sugar
Add in the egg yolk and the vanilla extract and mix.
1 Egg yolk, 1 tablespoon Vanilla extract
Add in the flour mix by spoonfuls. Mix until the dough forms. Knead the dough for just a few minutes until it is smooth.
Cut the dough into two equal parts, and shape each part into a log shape. Wrap each log into cling wrap and chill for at least one hour.
Preheat the oven to 375°F, and line two baking trays with parchment paper.
Cut the chilled log into ½-inch discs and Place them on the lined sheets. Leave an inch of space between them.
Bake for 10 minutes or until the edges start to set and golden. Let cool completely.
How To Prepare The Chocolate Dip
Place the chopped chocolate in a heatproof bowl and place it on a double boiler. Stir occasionally until the chocolate is fully melted.
1 cup Dark chocolate
Dip one corner of the cookies into the warm chocolate and place them on a rack to set. While the chocolate is still warm sprinkle them with Turbinado sugar, sea salt, or chopped nuts.