01 - Preheat your oven to 400°F (200°C). Line a baking sheet with parchment paper for easy cleanup.
02 - Arrange the prepared acorn squash wedges on the lined baking sheet. Drizzle with olive oil and season generously with salt and freshly ground black pepper. Toss to ensure all wedges are evenly coated. Arrange them in a single layer for optimal roasting.
03 - In a small mixing bowl, whisk together the pure maple syrup, melted unsalted butter, ground cinnamon, and ground nutmeg.
04 - Brush half of the prepared maple glaze generously over the acorn squash wedges. Place the baking sheet in the preheated oven and roast for 25 minutes.
05 - Remove the squash from the oven. Carefully flip each wedge and brush with the remaining maple glaze. Return to the oven and continue roasting for an additional 15 to 20 minutes, or until the squash is tender and beautifully caramelized.
06 - While the squash is roasting, combine the chopped pistachios, gluten-free rolled oats, almond flour, melted unsalted butter, brown sugar, and a pinch of salt in another small bowl. Mix until the ingredients form a crumbly texture.
07 - Spread the pistachio crumble mixture evenly onto a small separate baking tray. If there is space, bake this alongside the acorn squash for 8 to 10 minutes, stirring once halfway through, until it turns a golden brown. Once baked, remove from the oven and let it cool.
08 - Arrange the warm, roasted acorn squash wedges attractively on a serving platter. Generously sprinkle the cooled pistachio crumble over the squash just before serving.