Pumpkin and Chipotle Corn Chowder

Name: Pumpkin and Chipotle Corn Chowder
Ingredients: 3 tablespoons butter or vegetable oil; Flesh from a 3 pound pie-pumpkin, peeled and cut into 1-inch cubes (about 7 cups); 1 large onion, diced; 3 tablespoons all-purpose flour; 1 quart reduced-sodium chicken stock; 2 chipotle peppers in adobo sauce, finely chopped; 2 cups frozen corn kernels; 1/2 cup heavy cream; 5 thyme sprigs (or 1 tablespoon dried thyme, or to taste); salt and freshly ground black pepper; 1 small bunch cilantro, stems removed and leaves roughly chopped