Comfort Chicken and Yam Chili

Name: Comfort Chicken and Yam Chili
Ingredients: 1 medium onion, chopped; 1 whole garlic bulb, cloves separated, peeled and minced; Olive oil; 3-4 lb. fryer chicken, cut up; 2 (14 ½-oz.) cans chicken broth; 1 ½ c. chicken broth, divided; 1 T. chili powder; 1 t. salt; ½ t. crushed red pepper flakes; 1 t. black pepper; ½ c. quinoa, rinsed; 3 medium yams, peeled and cubed; 2 (15-oz.) cans black beans, rinsed and drained; 2 (16-oz.) cans kidney beans, rinsed and drained; 1 (14 ½-oz.) can diced tomatoes, undrained; Dollop of Sour Cream, optional