Heat oven to 350 degrees F. Butter a 1 1/2-quart casserole.
Season rice with salt and pepper. Combine sour cream, salt and chiles. In the
prepared casserole, place a layer of rice, cover with a layer of the sour cream
mixture, and top with strips of Monterey jack cheese. Repeat, making 2 or 3 layers
and ending with rice on top.
Bake for 40 to 45 minutes or until heated through.
Sprinkle with grated Cheddar cheese and return to oven until cheese is melted.