Heat oil in an 8" cast iron skillet or muffin pans in a 450 F. oven for 5 min. Combine cornmeal and next 4 ingredients in a medium bowl; make a will in the center of the mixture. Stir together buttermilk and egg; add to dry ingredients, stirring just until moistened. Pour into the hot skillet. Bake at 450 F. for 20 min. or until golden.