Preheat oven to 375 degrees and line a baking sheet with parchment paper.With a sharp knife slice off the top of your pumpkin.Slice your pumpkin in half from top to bottom. Scoop out the inside filling.Place both halves of your pumpkin sliced-side-down in your oven.Bake for about 35 - 45 minutes, depending on size.Season ground turkey with salt and pepper. Add oil to a pot and sauté diced onion and garlic for 5 min on medium heat. Add turkey. Use a wooden spoon to break up the turkey into bits, add to and sauté for another 10 min, until brown.Add crushed tomatoes, cinnamon, cumin, paprika, nutmeg, chili powder, salt, chicken stock or bone broth, and pumpkin puree.Remove the pumpkin from the oven, let it cool, scoop the flesh out, and add it to the chili. Cook for 45 minutes on low heat.Once chili is done, sprinkle with cilantro and serve with sour cream if desired.