Green Chiliaquiles with chicken

Name: Green Chiliaquiles with chicken
Cuisine: American, Mexican, Latin American
Ingredients: 30 tomatillos, dry-roasted; 1 poblano chile, dry-roasted; 4 serrano chiles, dry-roasted; 1 onion, quartered; 2 cloves garlic; 3 tablespoons chopped cilantro; (coriander), plus extra to; 3 tablespoons corn oil; 12 Corn Tortillas (page 36), cut into squares; 1 large cooked chicken breast shredded; 1/2 red onion, sliced sea salt; 1/2 cup (4 fl oz/120 ml) sour cream, plus extra to serve; 1 3/4 cups (7 oz/200 g) grated queso fresco or feta cheese plus extra to serve