Heat the coconut oil over medium-high heat in a large pot. Add the ground chicken and begin breaking it up with a spoon as it browns, about 8 minutes. Add the diced onion and cook until translucent, about 5 minutes. Add the minced garlic and cook for 30 seconds. Add all of the seasonings and stir until the meat/onion mixture is well coated. Add the crushed tomatoes, chicken stock (or water) and sweet potatoes. Bring to a simmer. After about ten minutes, add in the mushrooms and continue cooking until sweet potatoes are tender, about ten more minutes. Check seasonings and adjust if necessary.