01 -
Cream butter and powdered sugar with a spatula until pale and light in texture. Mix in egg yolk and vanilla extract until combined. Sift in flour and mix to form a soft dough.
02 -
Wrap dough in plastic wrap and refrigerate for 20 minutes.
03 -
Divide chilled dough in 2 pieces. Roll each piece into a log about 4 inches (10cm) long and 1 inch (3cm) in diameter.
04 -
Wrap each log separately in plastic wrap and freeze for 45 minutes.
05 -
Preheat oven to 356°F/180°C. Line a baking sheet with parchment paper. Roll the chilled logs in granulated sugar to coat evenly.
06 -
Cut logs into ⅜ inch (1cm) thick slices. Arrange on baking sheet and bake for 15-18 minutes until golden.
07 -
Leave cookies on baking sheet for 5 minutes after removing from oven - they'll crisp up as they cool. Then transfer to cooling rack.