Green Chicken Enchiladas

Name: Green Chicken Enchiladas
Ingredients: 2 cloves garlic, smashed; 1 medium yellow onion, diced; 2 jalapeno or serrano chilies, seeded and chopped; 1/2 cup loosely packed cilantro leaves; 2 tablespoons olive oil; 2 teaspoons ground coriander; 1 teaspoon groud cumin; 2 teaspoons salt; 2 1/2 pounds tomatillos, halved; 1 cup green pumpkin seeds (pepitas), optional (this makes for a chunkier, slightly richer sauce); 3 cups good quality chicken stock, or water; 3 cups shredded chicken; 1 cup shredded Monterey jack cheese; 12 corn tortillas; 3/4 cup Mexican queso fresco, crumbled