1. Combine beef and chili powder blend in a large Dutch oven. Cook 6 minutes over medium-high heat or until beef is browned, stirring to crumble. Drain and return to pan.
2. Stir in frozen corn mixture, broth, and tomato sauce; bring to a boil. Cover, reduce heat, and simmer 10 minutes. Uncover and simmer 5 minutes, stirring occasionally.
3. Ladle chili into bowls. Top each serving with sour cream and onions, if desired.