Slit each pepper lengthwise so peppers can later be stuffed with rice filling. Carefully remove loose seeds and veins, keeping stem intact. Rub pepper generously with oil and place on baking sheet; set aside.
Combine rice, sour cream, 1 cup cheese, corn and cilantro in a medium bowl. Season with salt and pepper. Divide mixture to stuff each pepper; sprinkle with remaining cheese. Bake in preheated oven 20 to 25 minutes, until peppers are crisp-tender and filling is heated through. Garnish with cilantro.