Mines fairly simple on the easy days...

6 cups chicken stock
1/2 butternut pumpkin
1 sweet potato
2 potatoes
1/2 brown onion (optional... I'm not good with too many onions)
1 clove garlic
1 tbsp chopped fresh sage (or 1 tsp dried sage)
1 bay leaf
salt & pepper
chopped chives for serving... and a dollop of sour cream if you want (or you could use natural yogurt)

I pop the entire lot in the slow cooker, except the chives and sour cream and then before putting it through the blender I take the bay leaf out.