Here is a Chulu East Peak climbing itinerary starting and ending in Besisahar (also known as Besishahar to Besishahar loop). This includes the approach trek, summit day, and return on the same route:
If you want a more relaxed pace, add a day in Manang or Ngawal.
If you want to explore further, continue toward Thorong La Pass and make it a circuit trek.
Let me know if you want this in Nepali or need a shorter or longer version.