Preheat oven to 400F/200C. Chop cooking pumpkin into bite sized pieces. (If using butternut squash, peel skin). In a small bowl add neutral oil, pumpkin pie spice, cardamom, garlic and sea salt. Whisk to combine. Drizzle mixture over pumpkin in a large mixing bowl, and toss to combine.
Line a baking tray with parchment paper and transfer pumpkin to tray. Spread pumpkin out so its not crowded (you might need two trays for this). Bake for 25 minutes, or until golden and cooked through. (Flip pumpkin pieces with spatula halfway through to ensure all sides are evenly roasted).
While you're waiting for the pumpkin to cook finely chop parsley and place to the side. Toast hazelnuts by chopping and adding to a skillet, bring to medium-high heat and toast, stirring often, until browned and aromatic.
In a large bowl add garlic clove (finely chopped), apple cider vinegar, maple syrup, cayenne pepper, and salt. Add chopped parsley and mix to combine. Add cooked pumpkin and gently toss in dressing to combine.
Lather plate with a thick layer of hummus and gently pour roasted pumpkin over top. Sprinkle with toasted hazelnuts and serve.