Preheat your oven to 400°F (200°C).
Toss butternut squash cubes in olive oil, salt, and pepper.
Spread squash on a baking sheet and roast for 25 minutes until tender.
In a large pot, cook pasta according to package instructions; drain and set aside.
In a skillet, heat olive oil over medium heat and sauté garlic until fragrant.
Add roasted squash to the skillet, along with vegetable broth and nutmeg.
Blend the mixture until smooth, then stir in heavy cream.
Combine pasta with the sauce, mixing until well coated.
Adjust seasoning as needed with salt and pepper.
Serve hot, garnished with parsley and pumpkin seeds.