Cut the squash into wedges. Scoop out the seeds, cut off the rind, and dice the squash.
Heat the oil in a large skillet over medium-high heat. Add the squash, onion, and garlic. Sprinkle with a little salt and saute until lightly browned and the squash is cooked through.
Place the cooked squash in a blender and add the milk and cayenne. Blend for 3-5 minutes or until the mixture is very smooth. Season generously with salt. Top each serving with toasted walnuts, cheese, or cream.
Notes
This is a quick and easy soup, perfect for a weeknight meal.