Heat your pasta water in a cooking pot until boiling and add plenty of salt. Boil the pasta according to the instructions on your pasta package to your desired cooking stage.
While the pasta is cooking, cut the lower half of the leek and the chicken breast into small pieces.
Turn the pan to high heat and add some olive oil. Once the pan is hot, add the chicken breast pieces to the pan and season the chicken with salt and pepper.
Let the chicken breast pieces fry until they start to caramelize on one side. Then flip the chicken around to fry on the other side and at the same time add the cut leek and let it cook for another minute or until chicken is caramelized on the other side as well.
Turn the heat to medium, add the and the baby spinach leaves and mix everything together until the leaves start shrinking in size.
Add the cream and the grated parmesan and let it simmer for a minute or until the cheese has completely dissolved the cream.
Mix your boiled pasta to the sauce and let it cook for another minute or two depending on how thick you prefer it to be.
Serve the pasta and optionally grate some more parmesan cheese on top for garnish. Enjoy!