I always make batches of different kinds of soup and freeze most of them..They are handy to have for a quick meal of soup and sandwich. I also give my children and grandchildren the soup as they have no time to fuss with making it they are too busy with kids and work and I am happy to pass out the soup to them.
In a large pot combine the onions, carrots, potatoes , parsnip,and water and cook until vegetables are very soft add broth and cook for another 5 minutes.
Using an immersion blender puree the vegetables..or puree in blender and return to pot..stir in cream and more broth depending on how thick you like your soup...serve .sprinkle with a little basil strips.
I usually make a double batch to freeze and then I leave out the cream and only add the cream to the soup when serving as creamy soups do not freeze too well.