Hi pink...if I were attempting that soup-without seeing a recipe-I would cook some chicken thighs seperately. Brown them in a bit of olive oil or butter,keep turning until thoroughly cooked,then set aside.
In a large pot I would saute one large onion,finely chopped,and two cloves of garlic. To this I would add 2 potatoes-peeled and diced. Cook until soft. Add 2-3 chicken stock cubes, and 4 cups water...then bring to the boil. Let simmer gently. Strip the chicken off the bones,set aside 1/3 of it,putting the rest into the pot. Add fresh sage leaves...1/2 dozen or so.Liquidise,add aprox 1/2 cup cream until you have desired consistancy. Mix in the rest of the chicken and re-heat gently.Serve,garnished with finely chopped sage leaves.