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Preparation
- In a large bowl, add butter, granulated sugar, powder sugar, and salt and beat until smooth, about 1 minute.
- Mix in egg yolks one at a time, followed by the vanilla.
- Slowly add in flour until just combined. Form dough into a rough ball and chill in the fridge for 30 minutes.
- Once chilled, divide the dough into two even portions and form into logs with round or square sides. Wrap tightly with plastic wrap and freeze for a minimum of 2 hours.
- When ready to bake, preheat oven to 325 degrees F and line a baking sheet with parchment paper.
- Sprinkle sparkling sugar on a large plate and roll the sides of the logs in the sugar.
- Place logs on a cutting board and slice into cookies about 1/3 inch thick.
- Place on cookie sheet and bake for 7-10 minutes.
- Allow cookies to cool for about 5 minutes, then transfer to a cooling rack.