We took a risk with this one and it ended up being one of the most delicious surprises of the year! (friediceanddonutholes.com)
For a special delicious surprise - Add in a raspberry to each muffin before you bake and these become dark chocolate muffins with a gooey raspberry center! (glutenfreepalate.com)
The small chunks of banana is a little delicious surprise instead of eg. (atastylovestory.com)