3 ears corn, husked
Olive oil, for drizzling
1/2 onion, thinly sliced
3 poblanos, charred, stemmed, seeded and julienned (see Cook's Note)
Kosher salt and freshly ground black pepper
3 cups shredded Monterey Jack cheese
Tortilla chips and/or plantain chips, for serving
To char the chiles (or any fresh chile): Put the chiles over a gas flame or underneath the broiler and cook until they are blackened on all sides. Enclose them in a plastic bag and let stand for 10 minutes to steam, which will make them easier to peel.