Yeah, I've always assumed it was nonsense, but it's kind of a fun myth (and mostly harmless), so when I found this image on my HDD, thought I'd post it...
This reminds me of the old chain letters that said you have to snail mail it to 10 people or someone would die, or you would lose your job, house, etc.
Oatmeal blended into a powder sounds interesting. I've added some oatmeal to chocolate chip cookies before for some flavor and chew. Not sure about putting it in the blender. Also 112 cookies? I thought those were large quantities but damn.
My grandfather's been making these annually for christmas since the 60s. They usually put the extras on sheet pans and freeze them until they're ready to bake them.