2 ¾ cups all-purpose flour
½ teaspoon baking powder
1 teaspoon vanilla extract
Preheat the oven to 375 degrees F (190 degrees C).
Stir together flour, baking soda, and baking powder in a small bowl.
Cream butter and sugar until smooth in a large bowl. Beat in egg and vanilla. Gradually blend in dry ingredients. Roll rounded teaspoonfuls of dough into balls, and place onto ungreased cookie sheets.
Bake in the preheated oven until golden, 8 to 10 minutes. Let stand on cookie sheet for 2 minutes before removing to cool on wire racks.