How to Roast and Clean Poblano Chiles (mexicanfoodjournal.com)
Poblano Chiles Poblano chiles are a mild green chile typically used to prepare chiles rellenos, rajas con queso, and crema de poblano. They need to be roasted and peeled before cooking to remove the tough outer skin which is difficult to digest. Roasting also adds flavor. Roasting Methods Roasting Poblano chiles on a gas stove is my preferred method. If you don't have a gas stove or you don't want to place the chiles on an open flame, see the Alternative Roasting Methods. Roast the chiles directly on the flame. Do not  leave the chiles unattended. You want to blacken the chiles evenly, like