Cut the poblano peppers in half and remove the stem and seeds (if desired, leave seeds)
Preheat grill to medium; if you're concerned about your grates, you may want to light grease a piece of aluminum foil and place on grill prior to peppers
Place the pepper, cut side down and let them cook, covered, for about 6 to 7 minutes (peppers should be lightly charred)
Flip peppers and drizzle with olive oil and chipotle pepper, letting them cook for 6 to 7 minutes
Add cheese, filling peppers and melt cheese for an additional 4-6 minutes
Remove from heat carefully, top with red pepper flakes if desired