Cream the butter and sugar in a large bowl until the mixture is light and fluffy.Beat in the egg and vanilla extract until well combined.Sift in the flour, 1 teaspoon ground cinnamon, baking powder and salt and gently mix together to form a soft dough.
Using your hands, roll the dough into walnut sized balls then roll in the sugar and cinnamon mixture to coat.
Place on a baking tray, spaced about 3 cm apart. Flatten gently with a fork.
Bake in the oven for 12 minutes or until they feel firm around the edges.
Allow to stand for a couple of minutes on the baking tray, then carefully transfer to a wire rack to cool.