Mix sugar and butter. Add the egg and vanilla mixing thoroughly. In a separate bowl, mix together dry ingredients. Blend into butter mixture. Refrigerate dough 2 to 3 hours. Preheat oven to 375 degrees. Divide dough in half and roll 3/16 inch thick on floured surface. Cut dough with cookie cutter and sprinkle with sugar. Place on lightly greased cookie sheet and bake 7 to 8 minutes or until delicately golden.