Place green and red peppers, cut side down, on a foil-lined baking sheet. Bake, uncovered, in a 425 degree F oven about 20 minutes or until skins are charred. Immediately wrap hot peppers in the foil and let stand for 20 to 30 minutes or until cool enough to handle. (The steam will loosen the peel.) Peel off skins and cut peppers into strips.