Heat a large heavy pot or Dutch oven over medium heat. When hot, spray with oil. Add onions and garlic; sauté until soft, about 4 to 5 minutes.
Add turkey meat, breaking it up with a wooden spoon while cooking; cook until meat is white and cooked through, about 5 minutes.
Add diced green chilies, salt, cumin, oregano, chili powder and red pepper flakes; cook for 2 minutes. Purée 1 can of beans in a blender with ½ cup broth. Add purée, second can of beans, broth and bay leaf to the turkey meat; bring to a boil.
Cover and reduce heat to a simmer; cook about 30–35 minutes, or until thickened and flavors have melded. Stir the chili occasionally while cooking.
Stir in sour cream or yogurt and cook 4–5 minutes. Adjust seasonings and salt to taste.
To serve, ladle chili into individual bowls and add your favorite toppings.
Slow cooker directions: Follow above instructions through cooking the turkey, add the rest of the ingredients including pureed beans, reducing the broth to ¾ cup and transferring the chili to a slow cooker. Cook on low for 8 hours.