@Jessica
You can also crumble in a little blue-veined cheese like stilton or gorgonzola for a little extra protein, or sprinkle on some chopped toasted walnuts.
Instead of sour cream, try low-fat yoghurt or fromage frais, which is even better.
Oh, also you could try doing soup with watercress, which is
wicked good for you.
I like butternut squash & roasted pepper soup: peel and de-seed a squash (or a pumpkin) and cut into 1/2 inch cubes. Quarter some red and yellow peppers and roast in a medium oven (around 350F) for about 20-25 minutes, turning a couple of times. You can do this in the broiler or in a griddle pan if pushed for time.
Toast some cumin seeds in a large saucepan, and add some ground cilantro and a chopped red chilli, then pop in the cubed squash/pumpkin and cover with around a litre of stock/broth. If you like a thicker consistency, or need some more protein, put in some red lentils at this stage. Simmer until the squash is tender, then toss in the peppers. Bring to the boil, whizz it up with a blender and serve.
I like to mix a little lemon zest with low-fat Greek yoghurt and stir a spoonful of it into the soup to give it a little extra yum-factor.
Enjoy!