Cut the chicken breast fillet into bite-sized cubes. Clean and wash the leek and cut into thin slices.
Heat the oil in a saucepan and fry the chicken cubes in it. Add the leek and mushrooms and stir-fry for about 5 minutes. Pour in the broth, bring to the boil and stir the processed cheese into the soup.
Let the soup boil for approx. 5 minutes and season with salt and pepper before serving.
Variants:
Use only a stick of leek, 1/2 bell pepper and broccoli.