01 - Preheat the oven to 400°F and line a baking tray with parchment paper.
02 - Toss butternut squash cubes with olive oil, salt, and black pepper. Spread evenly on the tray and roast for 25-30 minutes until soft and slightly caramelized.
03 - While squash roasts, soak cashews in hot water for 15 minutes, then drain thoroughly.
04 - Bring a large pot of salted water to a boil. Cook pasta according to package instructions until al dente. Drain and set aside.
05 - Add roasted squash, soaked cashews, plant-based milk, nutritional yeast, lemon juice, Dijon mustard, garlic powder, onion powder, and turmeric to a high-speed blender. Blend until completely smooth and creamy.
06 - Taste the sauce and adjust seasoning with additional salt or lemon juice as needed.
07 - Pour sauce into the pot with drained pasta. Stir well to coat evenly. Gently heat over low heat, stirring constantly, until warmed through.
08 - For crunch, mix panko breadcrumbs with olive oil and toast in a skillet over medium heat until golden. Sprinkle over mac and cheese with chopped parsley before serving.