Sickerdoodles: 1/2 cup butter (1

Sickerdoodles: 1/2 cup butter (1 stick), softened, 1/2 cup granulated sugar, 1/3 cup brown sugar, 1 egg, 1/2 teaspoon vanilla, 1 1/2 cups flour, 1/4 teaspoon salt, 1/2 teaspoon baking soda, 1/4 teaspoon cream of tartar