01 - Preheat oven to 400°F. Line a baking tray with parchment paper.
02 - Toss cubed butternut squash with 1 tablespoon olive oil, salt, and pepper. Spread evenly on the baking tray and roast for 20–25 minutes, turning once, until golden and tender. Allow to cool slightly.
03 - Place kale leaves in a large bowl. Drizzle with 1 teaspoon olive oil and a pinch of salt. Massage with hands for 1–2 minutes until softened and darkened.
04 - In a small bowl, whisk remaining olive oil, apple cider vinegar, maple syrup, Dijon mustard, salt, and pepper until emulsified.
05 - Add roasted squash, red onion, and apple slices if using to the kale. Drizzle with the dressing and toss to combine.
06 - Sprinkle walnuts, crumbled feta cheese, and pumpkin seeds if used over the salad. Toss gently and serve immediately.