heat overn to 375 degrees. Grease a 9 x 13 baking dish. Cook bell pepper and onion in oil in large skillet over medium-high heat until softened, about 5-7 minutes. Combine cooked rice, sour cream, soup, green chilis, corn and cooked peppers and onion and 1 cup of the cheese in a large mixingbowl. Blend well. Season with salt and pepper.
Pour into greased baking dish. Cover with foil and bake 30 minutes. Remove foil and sprinkle with remaining 1 cup of chesse. Bake an additional 10 minutes or until cheese is melted and the casserole is bubbly.