Sift together the flour, cinnamon and salt into a large bowl. Rub in the butter with a fork until mixture becomes crumbly. Add sugar and vanilla essence then mix to a stiff paste. Mix in egg. Knead dough on a floured surface until smooth. Wrap in foil or cling wrap and refrigerate for 30 minutes.
Preheat oven to 180 degrees C. Grease baking trays. Roll out dough thinly and cut into 24 rectangles.
Bake 12 to 15 minutes or until lightly golden in colour. Let cool on wire rack.