Preheat oven to 400 degrees. Prepare an 8" by 8" by 2" pan with vegetable oil coating. Sift together all dry ingredients. Combine egg and buttermilk and add to dry ingredients all at once; add oil. Stir (do not beat) just until dry ingredients are moistened. Pour into the prepared pan and bake 25-30 minutes. Cut into 16 2-inch squares. Food Exchanges per serving: 1 STARCH EXCHANGES + 1/2 FAT EXCHANGE CHO: 13; PRO: 2g; FAT: 3; CAL: 91; Low-sodium diets: Omit salt