This all started when I found a vegan muffin recipe and decided that instead of topping the muffins with walnuts (my parents have a walnut tree in their garden; it's close to sacrilegious to purchase whole walnuts at the supermarket when they have literally bags and bags of them) to use a new muesli breakfast cereal thing I just discovered existed in my local supermarket. It's protein-enriched, however, making it the only non-vegan ingredient, as the protein comes from whole milk.
However, any topping works as long as it can be baked. Obviously. ( Baking never lets me down, even with the ever-present threat of potential kitchen-destruction. )
As this entire endeavour was a success, I will definitely repeat it and prepare better for next time, though I'll probably end up using vanilla-flavoured protein powder instead of vanilla extract, I just know it.