In a large saucepan, heat the oil over medium heat. Add the garlic and green onion, and cook for about 1 minute. Add the ground beef and cook until browned, about 5 minutes. Stir in the chili powder until fully combined. Add the tomatoes, beans, bell pepper, carrots, brown sugar, and salt. Bring the mixture to a boil, then reduce the heat to low. Cover and simmer the chili for 15 minutes.