Sweet Potato and Black Bean Chili

Name: Sweet Potato and Black Bean Chili
Prep time: 20 min
Cook time: 1 h 10 min
Total time: 1 h 30 min
Cuisine: American, Mexican, Latin American, TexMex
Ingredients: 2 pounds orange-fleshed sweet potatoes, peeled and cut into cubes; 0.5 teaspoon ground dried chipotle pepper; 0.5 teaspoon salt; 2 tablespoons olive oil, divided; 1 onion, diced; 4 cloves garlic, minced; 1 red bell pepper, diced; 1 jalapeno pepper, sliced; 2 tablespoons ancho chile powder, or to taste; 1 tablespoon ground cumin; 0.25 teaspoon dried oregano; 1 (28 ounce) can diced tomatoes; 1 cup water, or more as needed; 1 tablespoon cornmeal; 1 teaspoon salt, or to taste; 1 teaspoon white sugar; 1 teaspoon unsweetened cocoa powder; 2 (15 ounce) cans black beans, rinsed and drained; 1 pinch cayenne pepper, or to taste; 0.5 cup sour cream, for garnish; 0.25 cup chopped fresh cilantro, for garnish