My lovely little muffins were made using a pre-mix muffin pack from http://www.mrscrimbles.com/mixes.htm
I added 40g of banana as per the instructions (they say blueberries but I figured it could be any fruit.)
They came out perfectly and are soft and delicious. Also, I wasn't expecting much difference from my home made sponge fairy cakes but they have a distinct muffin texture.
I used dairy free milk and marge instead of cow milk and butter too.
Fully recommended! (This blog post isn't sponsored!)