Ate a muffin I made yesterday for dinner, tasted much better the next day actually, which I hear is common with muffins.
I made a new batch today, improving on the mistakes I made yesterday. Used yoghurt instead of milk, cut way down on the butter, and added more oats as well as an extra egg. I think the texture improved a lot, even though these are gluten and sugar free (used xylitol instead of sugar).
I'm quite proud of these, they're going to be frozen and serve as a quick breakfast (removed from the freezer the night before then heated in the oven). They're mixed berries this time, and without the white chocolate, except for a couple of buttons on top for decoration: