Preheat oven to 400F. Slice the sweet potatoes in half, lengthwise, drizzle the cut side with olive oil, and place them cut side down on a baking sheet. Roast for 30 minutes then remove from oven and use a spoon to scoop out the inner flesh. Save it to add back in to the chili
While the sweet potatoes are roasting, start the chili in a Dutch oven or deep pan. Warm up some olive oil and brown the ground turkey
When turkey is at least 90% cooked, add in diced zucchini and mushrooms. Cook until tender, about 5 minutes
Add in the spices, tomato sauce and black beans (drained and rinsed if using canned). Cook everything for a few more minutes while you stir
Add in the sweet potato flesh that you scooped out, mix it in well to the chili, then spoon the chili into the hollowed out sweet potato. Put them back into the oven for another 15-20 minutes
Serve with optional toppings: sour cream, grated cheese, green onion, jalapeno peppers