Cream butter and sugar together and then add egg and vanilla. In a separate bowl combine flour, baking powder and salt. In another bowl add 1/4 cup sugar and 1 1/2 tsp cinnamon.
Dough should not be sticky, if it is mix in 1 Tablespoon flour at a time. If crumbly add 1 tsp water.
Roll dough into a ball and roll in cinnamon and sugar mixture. Place on cookie sheet.
Bake at 350 for 12-15 minutes.