In the Kitchenaid mixer (or a large bowl), cream together the butter and caster sugar.
Add eggs one at a time to the dough mixture.
Add flour, baking powder, salt, vanilla extract and beat until well blended.
Shape the dough into a ball and cover with plastic wrap and refrigerate for a minimum of 2 hours.
Preheat oven to 180 C and line baking sheets with parchment paper.
In a small bowl, combine cinnamon and additional 2 tablespoons sugar.
Shape the dough into balls and roll in the cinnamon and sugar mix. Place them about 2 inches apart on cookie sheet.
Bake for 10 - 12 minutes until lightly brown.
Cool on wire rack and store in an airtight container.