I was rushing through the recipe and accidentally confused tablespoons with teaspoons. That meant that I added in a little too much cinnamon (can't be too bad). I would have added too much almond extract, but there wasn't enough left in the bottle.
Make sure to heavily grease your muffin tin (or use muffin tin liners) - these have a tendency to stick a little.
Here's a nice view of the inside. The apples get soft and spread out into every bite. I give these 2 days before we eat them all!