Preheat oven to 375° (if using air fryer, skip this step)
For gas stove: Roast the poblano directly over the flame until blistered on all sidesFor oven: Place the poblano on a parchment-lined baking pan and rub lightly with oil. Place in 475° oven for 20 minutes, rotating every 5 minutes (approx) until blistered on all sides While poblano cools, dice onion and celery and combine in a bowl with minced garlic
Peel the skin off the poblano by rubbing with hands or between two paper towels, dice, and add to bowl with other veggies
In a separate bowl, combine salt, pepper, adobo, and basil
Rub olive oil all over hens, then rub salt mixture all over
Stuff cavity of then hen with the vegetable mixture
Bake* at 375° on an ungreased pan for 1 hour or until a thermometer reads 160°
Remove from oven, tent with foil, and let rest for approximately 10 minutesDo not skip this step to ensure the hen gets to a safe temperature of 165° while resting