Turkey Chili with White Beans

Name: Turkey Chili with White Beans
Ingredients: 1 tablespoon vegetable oil; 2 medium yellow onions; 1 1/2 teaspoons dried oregano; 1 1/2 teaspoons ground cumin; 1 1/2 lbs lean ground turkey; 1/4 cup chili powder; 2 bay leaves; 1 tablespoon unsweetened cocoa powder; 1 1/2 teaspoons salt; 1/4 teaspoon ground cinnamon; 1 28-oz can diced tomatoes; 3 14-oz cans beef stock or broth; 1 8-oz can tomato sauce; 3 14-oz cans small white beans; 1 red onion; 1 fresh cilantro; 1 plain low-fat yogurt or sour cream