Step 1: The Booker Prize is one of the most prestigious literary awards in the world.
Step 2: In 2023, the Booker Prize was awarded for the novel \textit{``The Seven Moons of Maali Almeida''}.
Step 3: The author of this award-winning novel is Shehan Karunatilaka.
Step 4: Hence, the correct answer is Shehan Karunatilaka.