Spread the butternut squash and sweet potatoes over a roasting tin. Sprinkle with the turmeric, thyme, nutmeg, cumin, salt and pepper, then drizzle with olive oil and toss to coat.
1 medium butternut squash, 2 large sweet potatoes, ½ teaspoon ground turmeric, ½ teaspoon dried thyme, ⅛ teaspoon ground nutmeg, ¼ teaspoon ground cumin, olive oil, salt, black pepper