I have been buying their blueberry muffins and chocolate brownies for my
gardener. He really seems to like them. I try to get them while on sale but
making my own would be cheaper I'm sure.

I have looked online and all of the recipes I seem to see have flour (gluten
or otherwise) and/or oats in them. He is okay with oats (sand I see that
the originals do contain oats) but would prefer less processed things and
tries not to eat much of any kind of grain based flour. I suppose a brown
rice flour might work or coconut flour, but I would like to stick as closely
as I can to their recipe.

Does anyone have such a recipe?

Here is their website:

https://flax4life.net/

They are cheaper per item online but I'll bet shipping is a killer!