The recipe page cannot be found under 'Instructions', but when I visited the website I could find the recipe. These are really good muffins. I had 100g less zucchini so I added a bit more yoghurt, and they came out perfectly moist. I used 85% chocolate, but next time I'd try the suggested 75% (and would grate it instead of attempting to cut into powder). I don't really enjoy the muffin having melty chocolate on the top (with two small kids), but this tastes amazing.
I baked the normal sized muffins for about 21 minutes and the mini muffins for about 13.