In a large bowl, combine the cornmeal, baking powder and salt. In another bowl, whisk the eggs, corn, sour cream and oil. Stir into dry ingredients just until moistened. Fold in 1 cup cheese and jalapenos.
transfer to a greased 9 inch square baking pan. Sprinkle with remaining cheese. Bake at 350 degrees for 35 to 40 minutes or until toothpick inserted near the center comes out clean. Serve warm.