Preheat oven to 450 degrees F. Grease 8-inch iron skillet or baking dish. In mixing bowl, combine dry ingredients. Stir in corn, onions, jalapenos, and cheese. Combine oil, eggs and buttermilk.
Add to dry ingredients. Stir only until dry ingredients are moistened. Turn into skillet. Bake for 25 to 30 minutes or until lightly browned. This will be moist, not dry inside.