Sausage, Corn and Poblano Chowder

Name: Sausage, Corn and Poblano Chowder
Cuisine: American
Ingredients: 5 tablespoons unsalted butter, divided; 4 fresh sausage links (such as spicy Italian or garlic), casings removed; 2 sweet onions, chopped; 4 celery stalks, chopped; 5 poblano peppers, stem and seeds removed, chopped; 4 garlic cloves, minced; ⅓ cup all-purpose flour; 4 cups chicken broth, homemade or store-bought; 1 cup whole milk; 1 teaspoon ground cumin; 1 teaspoon ground coriander; Cayenne pepper, to taste; Kosher salt and freshly ground black pepper, to taste; 2 large russet potatoes, peeled and diced; 3 cups corn kernels, frozen or drained, if canned; ½ cup heavy cream; ½ cup chopped fresh chives, plus more for garnish; ½ cup chopped fresh cilantro, plus more for garnish