Cut the chicken into strips. Marinate with the garlic, chilli, parprika, chilli flakes and lemon and black pepper seasoning and set aside
Boil the pasta as per package instructions and reserve a cup of pasta water
In a large pan heat 2 tablespoon vegetable oil or light olive oil, on high heat. Fry the chicken strips in 2 batches. Don't overcrowd the pan. Fry both sides until slightly brown. About 30 seconds each side. Don't worry if not fully cooked, it will cook further in the sauce
Reduce the heat to a low temperature. In the same pan heat 2 tablespoon butter. Once butter is melted add 2 tablespoon flour. Whisk for about a minute.
Add the cream and the milk. Allow the sauce to simmer, whisking at regular intervals. The sauce will thicken. Add salt and more pepper if you wish.
Add the chicken to the sauce and let is heat through. Mix in the pasta and add the parmesan and some parsley
If you are not serving the pasta straight away you can add the reserved pasta water to thin down the sauce when serving