Cut the butternut squash in half lengthwise and scoop out the seeds. Place the halves cut side up on a baking sheet.
Drizzle with a bit of olive oil and sprinkle with sea salt. Roast in the preheated oven for about 25-35 minutes, or until tender.
Once the squash is done roasting, remove it from the oven and let it cool slightly. To make room for the filling, scoop out some of the squash flesh, leaving about a ½-inch layer all the way around the interior. Reserve the scooped out flesh for later use.
In a large skillet, heat the olive oil over medium heat. Add fresh sage leaves and toast until crispy, about 1-2 minutes. Remove from the pan and save for serving. If using dried sage, add it together with the rest of the herbs later.
To the same pan add the diced red onion and sauté for about 3-4 minutes until translucent.
Add the minced garlic and diced mushrooms to the skillet. Add the sage, rosemary, thyme, sea salt, and black pepper. Sauté for another 5-7 minutes until the mushrooms are browned and have released their moisture.
Add chopped spinach and cook until it wilts, about 3 minutes.
Stir in the smashed chickpeas, chopped walnuts, tamari sauce and the scooped-out butternut squash flesh. Taste and add more salt and pepper if needed.
Carefully spoon the filling into each half of the butternut squash, packing it slightly.
Sprinkle with vegan Parmesan.
Return the stuffed squash to the oven and bake for an additional 10 minutes until heated through and golden on the top.
Garnish with fresh parsley and crispy sage before serving.
Notes
Refrigerator: Store leftover stuffed squash in an airtight container in the refrigerator for up to 4 days.
Freezer: Store leftovers in a freezer-safe container or bag. It will keep well in the freezer for up to 2 months. Thaw it in the refrigerator before reheating.
Reheat: To reheat, place the stuffed squash on a baking sheet and bake at 350°F until heated through. The microwave also works, but it’s more prone to heating unevenly; you may want to cut it into a few pieces for more even reheating.