Shortbread with Cinnamon

ingredients:
125 g butter, softened
125 g brown sugar
1 egg, beaten
1 yellow
2 teaspoons cinnamon
1 pinch of salt
250 g flour
method :

Beat the butter and sugar until the butter melts.
Add the egg and cinnamon and salt.
Stir in the flour and mix well.
Preheat oven to 150 ° C (gas mark 5, 300 ° F).
Make a ball and flatten the dough to cut out circles.
Arrange them on a plate covered with parchment paper
Train braces with back of a fork and brown them with the egg yolk.
Bake for 15 minutes until the biscuits are golden.
http://www.odelices.com/recette/sables-de-noel-a-la-cannelle-r94/