I don't have a proper food processor, just a little baby-food-sized one, so when I made Alton Brown's all-oats oatmeal cookie recipe before, I used half oat flour and half rolled oats. They were perfect, so I'd like to repeat them for my friend with celiac disease. I found gluten-free rolled oats, but the only oat flour I can find is labeled "may contain traces of wheat." Is there a way I can make rolled oats into flour with something other than a food processor?

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    Not sure if you've asked your friend, but its possible "traces of wheat" isn't actually a problem, it'd only be a problem if you actually had non-trace amounts of wheat. (Health questions like that are beyond our expertise). – derobert Dec 24 '16 at 6:53
  • There are some people for whom even trace amounts of wheat gluten are a serious problem, so it's important to check. – pjc50 Dec 24 '16 at 14:04
  • @derobert: my friend was diagnosed less than a year ago, so she's still figuring things out, but the most recent blood test showed low-level gluten exposure, so right now, even "traces of wheat" is off the menu. – JPmiaou Dec 24 '16 at 16:19

You could use a mortar and pestle, if you have a good (and large) one - though it would take a lot of time and grinding to make it work, and probably small batches to fit your mortar and pestle size, it is doable, especially if this is a one-time use. you would probably not want to do this often, though.

You might try a blender, it's very similar to a food processor if you happen to have one. I would not recommend an immersion blender, as the oats (and flour) would fly everywhere (as opposed to liquid which holds together a bit more), but a regular blender should work well (also, keep it covered, though).

If you have a coffee grinder, that's also a possibility - it is intended to turn beans into powder, this is just a different grain. You might want to make sure it's quite clean unless you want coffee flavored cookies, though.

And final option, if you have a spice grinder, that should also work. Some people get a spare coffeee grinder for the job, or if you have a little hand crank grinder (like some people use for pepper or cinnamon or such), that would also work - though again, lots of work and small batch sizes, but possibly worth it for one time.

Additionally, if you toast the oats a bit, they should be dryer and easier to grind (and toasting gives a bit of flavor) - this will help especially if you're using one of the hand methods, like mortar and pestle or tiny spice grinder.

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  • +1 for a blender, if you have a nice one it does a better job than a food processor. – Dan C Dec 23 '16 at 21:37
  • The Alton Brown recipe starts off with toasting the oats, so that's covered, but I don't have a jar blender, either. – JPmiaou Dec 24 '16 at 1:53
  • If I had a mortar and pestle like the ones they have at Hampton Court Palace's Tudor kitchens.... (I can't figure out how to attach a link to text in comments: hrp.org.uk/hampton-court-palace/visit-us/…) – JPmiaou Dec 24 '16 at 2:02
  • Thanks for the nice completist answer. I actually ended up using the baby food processor, in small batches, and resting it after every few minutes. It took most of an afternoon, and the result is crispier than the oat flour version. Next time, I'll make the trip to the specialty-natural-food store and hope they have GF oat flour. – JPmiaou Dec 24 '16 at 16:25
  • @JPmiaou - I'm glad you found my suggestions helpful. It's much easier, you're right, to pick up the right flour (or pick up the right tool) if you're going to be using such flour more often... some of the workarounds are alright for once or twice, but it's a lot of work each time, and easier to get a good product if you can. – Megha Dec 28 '16 at 2:55

We often use a coffee grinder to make almond flour for my son who is on a very restricted diet. We use a simple 19.99 blade grinder rather than a burr grinder. We've also used it to create powdered sugar from Xylitol and from ordinary cane sugar, and tapioca starch from tapioca pearls.

Good luck!

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    Should work nicely. It'll need to be done in small batches though; say 1/4 cup (20 g) max. The motors on those blade grinders will bog down if you feed them too much hard stuff at a time. – Wayfaring Stranger Dec 24 '16 at 0:28
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    Something that's really helpful is using a flour sifter, and then re running the stuff that didn't make it through. It goes surprisingly fast when you get used to the grind-sift-grind cycle. we can process 2 lbs of almonds into almond flour in about 20 minutes using the coffee grinder and flour sifter. – Paul TIKI Dec 27 '16 at 14:20

I just buy oats from my local supermarket and then I turn it into a flour for making my morning porridge in the microwave. The result is a creamy delicious porridge with bananas or tinned fruits, that I enjoy all the year around and never get fed-up with it. I found the best way to turn oats into flour, is by using a blender on fast speed or as I do, by using a 400 Watts Braun hand blender, this too on fast speed. When using the microwave to make your porridge, blend the four into some COLD milk, then stir in hot water, but not too much, otherwise you will end with a watery porridge and not a thick creamy porridge. It was my idea to use the oats as flour, so that once in the stomach, it will easily attach itself to the cholesterol and then you know the rest. It's a great idea if you want to reduce your cholesterol and lose weight.

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    Oats do not "attach themselves to the cholesterol" in the stomach. – user34961 Aug 2 '18 at 19:58
  • Um, yeah; what Jan said. But also: what exactly is a "hand blender"? – JPmiaou Aug 3 '18 at 0:21
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    hand blender == immersion blender – Kate Gregory Aug 3 '18 at 14:07
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    And how exactly does one use an immersion blender on a completely dry ingredient like rolled oats? I think mine would sieze up within minutes if I tried that. – JPmiaou Aug 4 '18 at 16:47
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    Hello, and welcome to Stack Exchange. The original poster was asking about dry oat flour, not a pureed liquid. – Daniel Griscom Aug 5 '18 at 3:58

Use a sift. It may take long, but the result is fine powder. Take some rolled oats and place it on the sift. Put the sift on top of a bowl or container. Rub the oat against the sift. After a while, you should have oat flour.

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    Thanks for the suggestion, but I don't know of a tool that has fine enough holes to make powder that's also strong enough to stand up to having rolled oats mashed through it. I certainly do not own a sifter or sieve that would suit. Can you find a picture of the sort of tool you have in mind? – JPmiaou Dec 2 '19 at 16:57

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