I'll post how I make Vanilla extract later today.  It's surprisingly easy to do as well as trying variations.

I'm so glad to hear it! Homemade vanilla?! Just how does one make homemade vanilla??

Well we made the cookies and they were very yummy.  I used our food processor for the oats and it worked really well.  Our blender is getting old and tired and I didn't want to chance giving it a heart attack.

The only thing different I did with the recipe was I used dark brown sugar instead of light as, well, I didn't have an light brown sugar.  That and I used my own homemade Vanilla (which has a dark rum base to it !!!) and added an extra teaspoon for good measure.

Everyone loved them as both cookies and filling them with ice cream to make mini sandwiches.

Thanks again DIY Maven.  My taste buds owe you one.

I've used both the blender and the food processor to make  grain "flours". The blender works better, at least mine does. Over both, I prefer the spice/coffee grinder, but five cups would take a long time.

You can also buy oat flour at fancier grocery stores, though the volume proportions would be different, obviously.

You're very welcome. I've never tried the food processor, but it seems like it would work.

Thank you!  My family and I thank you a thousand times!

Did you ever try using a food processor to cut the oatmeal or doesn't that work?  Not sure if that would work or if the oatmeal would just slide over the blades and not get cut.