Peel the squash and slice it in half lengthwise, scooping out the seeds. Place the halves cut-side down on a parchment-lined baking sheet and bake for 12 minutes to soften slightly. Remove and let cool just enough to handle.
Place two wooden spoons along the sides of each squash half to prevent cutting through. Carefully slice thin slits across the squash to create the hasselback pattern. Gently tuck the sliced garlic pieces into some of the slits, spacing them evenly.
Whisk together the olive oil, maple syrup, mustard, chili flakes, salt and pepper. Brush generously all over the squash, working the glaze down into the cuts.
Return to the oven and bake for 30–35 minutes, brushing again halfway through, until caramelized, golden, and tender. At this time, you can make the cashew cream to serve the squash over, if desired.
Transfer to a serving platter over the cashew cream if using, and finish with pistachios, vegan feta and parsley. Serve warm.
This works with most winter squash, including acorn squash and even pumpkins!
If you have allergies, adjust toppings accordingly. Pumpkin seeds instead of pistachios for a nut-free recipe is an easy swap. If you're allergic to any ingredients in vegan feta, you can simply omit.
Adjust seasonings to taste. Feel free to add your favorites like paprika or cumin for instance.
If you struggle with spice, use less chili, or add extra if you want a kick of spice.
Scale up as needed if you're expecting a large company.