Pre-heat the oven to 180C (356F) fan-forced and line a baking tray with baking paper.
Place the diced pumpkin, maple syrup and 1 tablespoon of the olive oil in a bowl and toss.
Spread the pumpkin in a single layer on the tray and cook for 20 minutes.
Add the walnuts and cook for a further 10 minutes.
Remove from the oven and leave to cool a little.
Toss the cooked pasta with the remaining olive oil and leave to cool.
Add the pumpkin, walnuts, spinach and chicken to the cooked pasta.
To make the dressing, place all the ingredients except the parmesan in a jar and shake (with the lid on!).
Toss everything together with the dressing.
Serve warm or cold topped with the shaved parmesan.