1. Heat oil in a Dutch oven over medium heat. Add chopped onion and garlic to pan; cook 5 minutes or until onion is tender, stirring occasionally. Add broth, hot pepper sauce, salt, and chicken to pan; bring to a boil. Cover, reduce heat to low, and simmer 15 minutes. Remove chicken from broth mixture; cool.
2. Add cornmeal and beans to broth mixture, stirring with a whisk; simmer 15 minutes. Mash about 1/4 cup beans against side of pan. Cut chicken into bite-sized pieces. Add chicken to pan; simmer 5 minutes or until mixture thickens, stirring frequently. Top each serving with yogurt; sprinkle with green onions. Serve with lime wedges, if desired.