I usually get random cookie and cake recipes from the internet and try them. They are good but all of them have floury taste to me. Possible culprits are the flour I use and how I mix and bake dough. I use Gold Medal All-Purpose Flour and my hands to mix ingredients, having no mixer. What can I get wrong? Is there an easy fix?
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 flour adequately before measuring. Don't undo your sifting by rapping your measuring cup on the counter either! Simply scoop, scrape to level and dump it in the mixing bowl.
I've only ever had this issue if I under cook the baked item. You get the same issue if you don't cook your roux long enough.