Preheat the oven to 400°
Use a fork to poke a few holes in the squash and microwave for 4 minutes, this makes it easier to peel.
Peel the squash, halve it, and remove the seeds. Cut into ½ inch cubes and place on a baking sheet with the half onion and garlic cloves.
Drizzle the squash with olive oil and season the squash with salt, pepper, Italian seasoning, sage, and nutmeg. Toss to coat
Raost for 35-40 minutes or until the squash is tender and begins to caramelize
Place squash, onion, garlic, and cream in a blender. Blend until smooth, adding stock if necessary to reach desired consistency.
At this point you can place in a saucepan on the stove to simmer for 15-20 minutes, or you can serve immediately.
Garnish with sunflower seeds, pistachios, cream, and/or a drizzle of olive oil if desired.