How-to Roast Peppers
Arrange pepper halves skin side up or whole peppers on a broiler pan coated with cooking spray. Broil on the closest rack position to the heat without the peppers touching the heat source. Broil until skins are blistered and blackened, about 10 minutes. For whole peppers, use tongs to rotate peppers a quarter turn. Broil and rotate until all sides are blistered and blackened.
Immediately place the peppers in a bowl; cover with plastic wrap and let stand 15-20 minutes.
Peel off and discard charred skin. Remove stems and seeds from whole peppers.