In a large bowl, whisk together the flour, cornmeal, sugar, baking powder, and salt. In a separate bowl, combine the eggs, milk, and oil. Add the egg mixture all at once to the flour mixture. Stir until just moistened (do not overmix). Fold in the cheese and the chiles. Pour the batter into the prepared pan and bake for 15 to 20 minutes, or until a wooden toothpick inserted in the center comes out clean.