Step 1: Identify the literary work.
'Pathummayude Aadu' (Pathumma's Goat) is a celebrated Malayalam novella known for its humour, simplicity, and vivid portrayal of Malabar Muslim community life.
Step 2: Recall the author.
It was written by Vaikom Muhammad Basheer, one of the most beloved writers in Malayalam literature, famous for works rooted in his personal experiences and the common people.
Step 3: Distinguish other authors.
O.V. Vijayan, M.T. Vasudevan Nair, and M. Mukundan are prominent Malayalam authors but none wrote this particular work.
\[ \boxed{\text{Vaikom Muhammad Basheer}} \]