Chiles Rellenos Gratin

Name: Chiles Rellenos Gratin
Ingredients: 4 poblano chiles; 1⁄2 cup finely chopped red bell pepper; 3⁄4 cup fresh corn kernels; 1⁄3 cup chopped green onion; 1 tablespoon pine nuts, toasted (optional); 2 garlic cloves, minced; 1 1⁄4 cups crumbled cheese, divided (pepper jack or chipotle jack kicks it up a notch); 2 tablespoons chopped fresh cilantro; 1 teaspoon salt, divided; 1 (15 ounce) can black beans, divided; 2 tablespoons butter; 1⁄2 teaspoon ground cumin (or to taste); 1⁄8 teaspoon ground nutmeg; 2 tablespoons all-purpose flour; 1 chipotle chile, seeded and minced (canned); 1 teaspoon chipotle adobo sauce (optional); 2 cups 2% low-fat milk; 1⁄2 cup dry breadcrumbs; corn chips