Add onion; cook over medium heat about 3 minutes, stirring occasionally until crisp-tender.
In the crockpot mix vegetarian burger crumbles, onions, beans and enchilada sauce.
In medium bowl, stir corn bread mix, milk, melted butter and egg just until moistened.
Stir in cheese and chilies. Spoon over mixture in slow cooker.
Cover; cook on Low heat setting 4 hours 30 minutes to 5 hours 30 minutes or until toothpick inserted in center of corn bread comes out clean. Serve tamale pie with sour cream and green onions.