Preheat oven to 190 C. In a small bowl, stir together flour, baking soda, and baking powder. Set aside.

In a large bowl, cream together the butter and sugar until smooth. I use my food processor to make this so easy, Beat in egg and vanilla. Gradually blend in the dry ingredients. Then Roll rounded teaspoonfuls of dough into balls, and place onto a parchment covered cookie sheet, make sure you leave space for them to spread.

Bake 8 to 10 minutes in the preheated oven, or until golden. Let stand on cookie sheet two minutes before removing to cool rack.