I usually use a sponge or butter cake if I want to make a rainbow cake but this fluffy and moist cake works just as well. It is a rather plain tasting cake, so I added in some orange oil and orange zest to give it some kick. The colours really brighten up the cake and my kids were thrilled to be eating this rainbow cake. I don’t make rainbow cakes often though as I am not keen to give them food with colouring but I guess once in a long while is fine.
Everyday Yogurt Cake (9 inch)