from Martha Stewart's Cookies
4 cups sifted all-purpose flour
1/2 teaspoon salt
1 teaspoon baking powder
1 cup (2 sticks) unsalted butter
2 cups sugar
2 large eggs
2 teaspoons pure vanilla extract
In a large bowl, sift together flour, salt, and baking powder. Set aside.
Use an electric mixer to cream butter and sugar until fluffy. Beat in eggs.
Add flour mixture, and mix on low speed until thoroughly combined. Stir in vanilla. Wrap dough in plastic; chill for about 30 minutes.
Preheat oven to 325 degrees. On a floured surface, roll dough to 1/8 inch thick. Cut into desired shapes. Transfer to ungreased baking sheets; refrigerate until firm, 15 minutes. Remove from refrigerator, and decorate with sanding sugar, if desired. Bake until edges just start to brown, 8 to 10 minutes. Cool on wire racks. May be stored at room temperature in an airtight container for up to 2 weeks.