Boil potatoes for 10 minutes until fork tender then drain.
Sautee the leeks in schmaltz on medium heat for 5 minutes.
Add the potatoes, two cloves of garlic, and a pinch of salt then sautee for another 5 minutes then set aside.
Add the chicken and garlic to the pan and cook for 5 minutes, adding more schmaltz if needed.
Blitz the potatoes, garlic, leeks and thyme while you're heating the chicken broth.
Add the potato puree, chicken, and fresh thyme to the broth then reduce it to a simmer and add the cream, stirring to mix.