Hamad bin Jubair bin Mut'im narrated from his father that he heard the Messenger of Allah (peace be upon him) reciting Surah At-Tur in the Maghrib prayer.
Hadith Referenceسنن دارمي / من كتاب الصللاة / 1330
Hadith Gradingتحقیق (حسین سلیم أسد الدارانی):إسناده صحيح ولكن الحديث متفق عليه، [مكتبه الشامله نمبر: 1332]
The time for the Maghrib prayer is short, therefore, one should recite short surahs, which are called "Qisar" (short surahs). However, sometimes reciting a surah from "Tiwal Mufassal" (the longer surahs) is also Sunnah, especially Surah Al-Mursalat or Surah At-Tur, as mentioned in the aforementioned hadiths. Thus, this is the Sunnah method.