1In large bowl, mix together cornmeal, flour, sugar, baking powder and salt. Make a well in the center of the mix and pour in the buttermilk, oil and egg. Stir lightly until ingredients are lightly moistened. Fold in cheese, corn and jalapeno; stir. Pour mixture into lightly oiled 8x8 baking dish.
2Bake at 375 for 25-30 minutes, or until tested clean in center. Let cool slightly, cut into squares.