Slice off the top of each pepper; remove seeds and membranes; rinse. Cook peppers 5 minutes in enough boiling water to cover; drain. Season inside of peppers with salt and pepper; set aside. Combine rice, beans, corn, onion, red pepper, jalapeÃ±o peppers, cumin and oregano. Spoon 1-cup (250 mL) rice mixture into each pepper; stand upright in 9 x 13-inch (3 L) baking dish. Cover with foil. Bake in 350F (180C) oven for 20 minutes. (Add about 5 minutes more if has been refrigerated). Remove foil and sprinkle peppers with cheese. Bake until cheese is melted, about 5 minutes. Garnish with jalapeÃ±o pepper slices.