02Stir beans, poblano chilies and bell pepper into sweet potato mixture. Cover and simmer until chilies are tender, about 15 minutes longer. Season to taste with salt and pepper. (Can be made 6 hours ahead. Cover and refrigerate. Rewarm over low heat before continuing, stirring occasionally.)
03Divide stew among 4 bowls. Top with sour cream, avocado and orange, if desired. Serve with Polenta Triangles.