Great question — answering as the UphillTech team:
Assuming you aren't very unlucky and happen to download a series of bad recipes I think it's one of a few things. It's possible you could be undercooking your goods. Fully cooked baked goods should not taste like flour. It's also possible that you could be mixing insufficiently. If this were the case though you'd likely have some cookies that weren't floury. The most likely culprit though is packed flour. If you are using volume measurements (most likely given the source) for flour, it's quite possible to use nearly twice as much flour as the recipe intends simply because your flour is packed down more than the author's was. I recommend using either a food processor or a sifter to sift your...
Full answer by hobodave: https://cooking.stackexchange.com/a/14617 (CC BY-SA 3.0).
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