I make Butternut Squash soup quite often and its delicious and so easy to make.
Just chop squash up into bite sized pieces, season and place on a roasting tin, spray with a little fry light and I usually sprinkle a few chilli flakes over it. Roast in a moderate oven until soft. Let it cool a bit and then pop in a blender with some low fat nat yog or low fat from frais or even some very low fat cottage cheese and blend. Add a little water if its too thick to preferred consistency and hey presto you have a gorgeous creamy spicy soup !