Muthoni is a founder member of Storymoja, a writer’s collective based in Nairobi, Kenya. She is an African author and storyteller who regularly presents in schools and at events. She has performed in both Kenya and the UK. Her stories have been published in literary journals in Kenya, S Africa, UK and USA. She is the author of two novellas published by Storymoja – "Halfway Between Nairobi and Dundori", and "Tracking the Scent of My Mother", which was short-listed for the Caine Prize. Muthoni has also written six children books, published by Storymoja. Her story, "Kamau’s Finish" is used as a world literature text in UK and American schools. In the latter, it is published in a critically acclaimed anthology compiled by Jane Kurtz - Memories of Sun.