Chicken Enchiladas with Poblano Sauce

For the Enchiladas::

boneless, skinless chicken breasts

green chili powder

olive oil

chicken stock

enchilada size flour tortillas

Monterey Jack cheese, shredded

red onion and cilantro for garnish, if desired

For the Poblano Sauce:

chicken stock

poblano peppers, stem and seeds removed

garlic

jalapeño pepper, stem and seeds removed (optional)

lime, peeled

light sour cream

cilantro

salt