Peel the garlic cloves. Crush them with a garlic press into a small bowl. Set aside.
Wash the parsley and chop it finely.
If you don't have any stock ready, boil some water and add a stock cube. This isn't the healthiest option, but it's quicker.
Melt the butter in a saucepan and add the flour. Stir and when it has thickened a little, add the crushed garlic, then pour in the stock or broth. Stir with a whisk.
Season with salt and ground white pepper.
It needs to boil once, then add the sour cream while balancing the temperature (i.e., take a ladleful of soup into a bowl, add the sour cream, stir with a whisk, then slowly pour it all back into the soup). Once it has boiled a second time, the soup is ready.
For a creamier consistency, blend the finished soup with a hand blender.
Finally, add finely chopped parsley.
Serve with wholemeal cheese bread, which you can make by sprinkling a little grated cheese on sliced bread and toasting it in the oven.