Stir butternut squash, sausage, potatoes, celery, carrots, chickpeas, crushed tomatoes, onion, tomato sauce, green bell pepper, garlic, curry powder, cumin, five-spice powder, salt, and pepper together in a slow cooker or tagine.

Cover and cook on High until butternut squash is tender and sausage is cooked through, about 2 hours and 30 minutes. Stir ingredients halfway through the cooking process if possible.