Cinnamon swirls

Ingredients:
175 gm softened butter (not melted, just soft)
50 gm brown sugar
50 gm icing sugar
2 egg yolks
2 tsp vanilla extract
300 gm plain flour

Mix the butter, sugars, egg yolks and vanilla with a wooden spoon till creamy. Mix the flour gradually. Then roll out the dough to a 20 cm/30 cm rectangle on a piece of baking parchment. Mix the sugar with cinnamon. Sprinkle it over the rolled out dough uniformly. Roll the rolling pin over it so that the mixture is pressed into the dough. Then start rolling the dough from the narrow side with the help of the parchment. Once it is rolled, chill it for at least a half hour. Then take it out and cut 20 biscuits out of it. Pre-heat the oven to about 200 c. Bake the swirls for about 12 minutes or until golden.