Preheat oven to 425ºF. Grease a cookie sheet. Combine dry ingredients in a large mixing bowl. Work butter or margarine into dry ingredients until butter is the size of small peas using a pastry blender or fork. Add remaining ingredients, mixing just until dry ingredients are moist. Turn dough onto a lightly floured surface and gather into a ball. Pat into a circle 3/4-inch thick; cut into 8 wedges. Place on cookie sheet. Sprinkle with sugar. Bake 12 minutes or until golden brown. Makes 8 scones.