1. Preheat broiler.

2. Roast peppers directly over a low gas flame or under the broiler, turning frequently with tongs, until blackened on all sides. Place in a bowl; cover tightly with plastic wrap. Let cool. Peel off charred skins; discard seeds and stems. Thinly slice crosswise and set aside.

3. Heat oil in a large cast-iron skillet over medium-high heat. Season chicken with salt and pepper and cook, turning once, until browned, about 2 minutes per side. Remove chicken from skillet and transfer to a rimmed baking sheet. Add sliced poblanos, onion, garlic, and cumin to skillet; season with a pinch of salt. Cook, stirring, until onion is soft and translucent. Top chicken with poblano mixture and sprinkle with cheeses. Place under broiler; broil until cheese is melted and bubbly, about 2 minutes.

4. To assemble, place chicken on bottom halves of rolls; top with crema and slaw. Sandwich with top halves of rolls; serve.