Cook turkey and onion in a skillet on medium heat, breaking up into small chunks. Cook until no longer pink. Drain off fat and discard.
Add cooked meat and all other ingredients to slow cooker, cook on low 6-8 hours. 4-6 quart slow cooker recommended. Add diced onions and cheddar cheese, if desired.
Notes
If you prefer spicier chili use our recipe for Turkey Sausage in place of using just ground turkey.