Start by preheating your oven to 200°C (400°F). You’ll want to roast the squash first. This adds depth to the flavor. Place the cut squash face down on a baking tray and roast for about 45 minutes or until soft.
Once the squash cools, scoop out the flesh and mash it into a bowl. You’ll want it smooth and creamy. Next, combine the mashed squash with heavy cream, the whisked eggs, spices, maple syrup, dark brown sugar, superfine sugar, and vanilla extract. Mix well until all ingredients meld together into a luscious filling.
Flour your work surface lightly. Roll out your pre-made pastry dough into a circle, about 3mm thick. Carefully drape it into your pie pan. Press it gently into the corners and trim off any excess. Don't forget to poke holes with a fork to prevent bubbling while baking.
Pour the filling into your prepared pastry. Do it slowly, allowing the mixture to settle into the crust. Give it a little jiggle to distribute evenly.
Pop your pie into the oven and bake for about 45 minutes. You’ll know it’s ready when the filling has set but still has a slight wiggle. Allow it to cool for at least 15 minutes before slicing into it. Letting it rest lets the flavors deepen.