So, I gave this GFDF muesli bar recipe a try; it failed.
I was unsure what to do about the honey that wasn't mentioned until the end stage (no volume given) so it could be the culprit and in the comments I see I wasn't the only one to have problems.
We ended up with beautifully sweet, crunchy GFDF muesli bars...that crumbled the moment you tried to pick them up.
Now, GFDF products aren't cheap so I recyled the whole lot into a cake mix; I broke up the muesli mix then added 1 cup plain GF flour, 2 teaspoons of baking powder and 1 cup of fruit juice, mixed thoroughly and viola!
GFDF Muesli Muffins, which got the thumbs up from the Aspie teen.