Prashna means a question. Prashnopanishad is a question and answer session where six genuine, advanced seekers approach a Rishi called Pippalada. The seekers' questions could be yours and mine and the Rishi's answers signify the scriptural voice gently guiding us through the tunnel of darkness to the light at the end.
If you have questions on creation, on life, its purpose and fulfilment, then just go for this text.
Swami Chinmayananda's commentary, on this Upanishad, like on all other Upanishads gives insights to the seeker to understand the subtle ideas in a easy and clear manner. His master strokes are very evident in his lucid writings on the Upanishads.