Sift flour into a large bowl; mix in butter until the mixture has the consistency of cornmeal. Using a wooden spoon, stir in buttermilk to form a dough. Transfer dough to a floured work surface; knead briefly until smooth.
Roll dough into a 1/4" thick rectangle. Cut dough into twelve 4"x3" rectangles; transfer to a baking sheet. Bake until golden brown, about 15-20 minutes. Cool slightly.