Preheat oven to 350 degrees F (175 degrees C). Grease an 8 inch square baking dish or a cast iron skillet.
In a small bowl, beat eggs. Mix in corn oil and buttermilk. Stir in 1 cup shredded cheese, creamed corn, onion, and jalapenos.
In a large bowl, whisk together cornmeal, flour, baking powder, soda, and salt. Stir the egg mixture into the dry ingredients. Mix well. Pour batter into prepared pan. Sprinkle remaining 1/2 cup cheese on top.
Bake for 30 to 35 minutes until center is set and top is golden brown.
