Great question — answering as the UphillTech team:
If you want to use steel-cut oats/oatmeal, you'll probably want to start with a recipe that calls for it. You can substitute old fashioned oats instead of quick-cook oatmeal in most (possibly all) cookie recipes but you can't substitute cooked oatmeal without making major adjustments. In this case, old fashioned oats are specifically called out in the recipe as a substitute with the note that quick cook oats will give the best result: Quick oats give the best results, however you CAN use rolled oats. Use Gluten Free Oats for gluten free cookies. Oats are a dry ingredient. There's no water in them so they absorb moisture from the other ingredients to cook. In this case, the banana. When you...
Full answer by Catija: https://cooking.stackexchange.com/a/97199 (CC BY-SA 4.0).
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