Preheat oven to 200C. Line an oven tray with baking paper. Place the pumpkin on the tray and drizzle with olive oil. Season with salt and pepper. Bake in oven, turning occasionally for 20-30 minutes or until golden brown and tender. Remove from the oven. Place spinach and avocado in a large bowl. Add the pumpkin and drizzle with vinaigrette. Gently toss to combine. Sprinkle with toasted pumpkin seeds for an added crunch.