I actually use Bueno Hatch Green Chilies but that may not be available to you in your area. Nor, the Green Chilie Powder. I'll include a link to where you can purchase it in my, "Roast Your Own Chiles," recipe below. It's well worth having in your spice rack!
https://cookpad.com/us/recipes/340607-mikes-roast-ur-own-chiles-20-recipes