Qul A udhu birabbil falaq

Sayyiduna Uqbah ibne-Amir (RadhiAllaho anho) narrates
that Rasulullah (Sallallahu Alaihi Wasallam) said:

O Uqbah ibne-Amir !
Indeed you cannot recite a dearer and more readily acceptable
Surah to Allah Subhanahu wa ta'ala than
Qul A udhu birabbil falaq
(Falaq:113).
Therefore, if you can recite it in your Salat,
then do it.

{ Ibne-Hibban }