Line an oven tray with baking paper. Place the pumpkin on the tray and drizzle with half the oil. Season with salt and pepper. Bake in oven, turning occasionally, for 20 minutes or until golden brown and tender.
Remove from oven.
Place spinach and avocado in a large bowl. Add the pumpkin and drizzle with vinegar and remaining oil. Gently toss to combine. Serve immediately.