Heat the olive oil in a large saucepan over medium heat.
Add onion, cauliflower, bell pepper and garlic; cook for 5 minutes.
Add ground chicken; cook ground chicken and vegetables for 10 to 15 minutes, occasionally stirring and crumbling the meat, until ground chicken is browned.
Stir in remaining ingredients (chili powder through broth) then reduce heat to low and simmer for 30 to 45 minutes or until vegetables are tender and ground chicken is cooked through.