01 - Preheat the oven to 425°F. Line a baking sheet with parchment paper.
02 - In a large bowl, toss the squash cubes with olive oil, salt, and pepper. Spread evenly on the prepared baking sheet. Roast for 25–30 minutes, turning halfway, until golden and tender.
03 - Combine quinoa, water (or broth), and salt in a medium saucepan. Bring to a boil, reduce heat to low, cover, and simmer for 15 minutes or until all liquid is absorbed. Remove from heat and let stand covered for 5 minutes, then fluff with a fork.
04 - In a small bowl, whisk together tahini, warm water, lemon juice, olive oil, maple syrup, sage, garlic, salt, and pepper until smooth and creamy. Add more water if needed for a pourable consistency.
05 - Toast the pumpkin seeds in a dry skillet over medium heat for 2–3 minutes until fragrant and just beginning to brown.
06 - Divide quinoa among four bowls. Top with roasted butternut squash, spinach, red cabbage, cherry tomatoes, and pumpkin seeds. Drizzle generously with sage tahini dressing. Add feta cheese, if using.
07 - Serve warm or at room temperature.