2 lb. poblano chiles
6 tbsp. unsalted butter
1 large white onion, roughly chopped
1 rib celery, roughly chopped
1 medium carrot, roughly chopped
4 oz. spinach, roughly chopped
1⁄3 cup minced parsley
4 cups chicken stock
2 cups milk
1 cup heavy cream
Kosher salt and freshly ground black pepper, to taste
1⁄2 cup crema or sour cream
1 serrano chile, stemmed, seeded, and minced
Fried tortilla strips, to garnish

Heat broiler to high heat. Place poblano chiles on a foil-lined baking sheet, and broil, turning as needed, until blackened all over, about 20 minutes; transfer to a bowl and let cool. Peel and discard skins, stems, and seeds; roughly chop, and set aside. Heat butter in a 6-qt. saucepan over medium-high heat. Add onion, celery, and carrot, and cook, stirring occasionally, until soft, about 10 minutes. Add chopped poblanos, spinach, and parsley, and cook, stirring, until slightly wilted, about 3 minutes. Add stock and milk, and bring to a boil; reduce heat to medium-low, and cook, stirring occasionally, until slightly reduced, about 35 minutes. Remove from heat, stir in cream, and season with salt and pepper; puree in a blender until smooth, at least 1 minute. To serve, divide soup among serving bowls and then dollop with about 1 tbsp. crema in the center of each; garnish with some of the serrano chiles and tortilla strips.