Cut bell peppers in half lengthwise; discard seeds and membranes. Place pepper halves, skin sides up, on a foil-lined baking sheet; flatten with hand. Broil 20 minutes or until thoroughly blackened.
Immediately place peppers in a large zip-top plastic bag; seal. Let stand 20 minutes. Peel peppers; discard skins. Chop peppers according to recipe directions.