Turkey Pumpkin Chili (slow cooker)

Another recipe I found in the January 2015 Women's Day magazine that I would like to try:
Need to find a substitute for sour cream.

2 cups low-sodium chicken broth
15 oz. can pumpkin puree
1 1/2 tsp. ground cumin
3/4 tsp. chili powder
1/2 tsp. cinnamon
1/8 tsp. cayenne pepper (I would probably leave this out)
1 lb lean ground turkey
1 large onion, finely chopped
2 large cloves garlic, finely chopped
2 4.5 oz. cans green chiles
2 15 oz. cans white beans, rinsed
sour cream, Daiya cheddar shreds, sliced radishes, and fresh cilantro leaves, for serving

In a 5-6 qt.slow cooker, whisk together the broth, pumpkin, cumin, chili powder, cinnamon, and cayenne.  Add the turkey and mix to combine.  Fold in the onion, garlic, chiles and beans and cook covered until the turkey is cooked through, 4-5 hours on high or 6-7 hours on low.  Serve with sour cream, Cheddar cheese, radishes and cilantro, if desired.

I'll post a picture when we try it.