Roasted Corn Poblano Chowder

Name: Roasted Corn & Poblano Chowder
Ingredients: 3 cups fresh corn kernels (see Tip); 1 medium red bell pepper, chopped (3/4 cup); 1 medium fresh poblano pepper, seeded and chopped (see Tip); 1 medium onion, chopped (1/2 cup); 1 fresh jalapeño pepper, seeded and chopped (see Tip); 2 cloves garlic, minced; ½ teaspoon ground cumin; 2 teaspoons canola oil; 2 ½ cups lower-sodium vegetable broth; 2 ½ cups water; 2 medium tomatillos, husked and chopped (1 cup); ¼ cup chopped fresh cilantro; ⅓ cup light sour cream; 1 bunch Fresh cilantro sprigs