Quoted:
To me, there are two types of cookies, those that are dry, crumble and break... and those that are soft, gooey, and moist. What is it that makes them moist and gooey vs. dry?
Now... give me your Peanut Butter cookie and Oatmeal cookie recipes.
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Storage ~ a lot of times (not sure about every time) - but a lot of times if you store your cookies with a slice of apple, they'll stay / get soft.
Just my personal observations from cookie making - you can take it or leave it:
Don't overmix. Overmixing is bad for the dough. It's very bad for the dough. If recipe calls for "mix until just combined" - mix it until it is 'just combined' and stop. If it says "mix for 30 seconds" - mix for 30 seconds. etc.
If you do end up with a dry and crumbly dough - add some more (whatever type of liquid you're using in your dough). Cream, milk, etc. An egg. Personally, I generally avoid adding butter because I don't like really 'greasy' cookies, but I do like buttery cookies
Alternate cookie sheets when baking if you can - while one is in the oven, the other is cooling back to room temp and you're starting with a 'fresh sheet' - you'll avoid some 'cookie spread'.
Personal preference - I always use
parchment paper - it is a Godsend in my kitchen in 822,000 different ways - least of which is - easy / quick pan clean up and allows for much faster cookie offload / pan cool off time.
If your cookie dough is too soft - Add a little bit of flour - starting a Tbsp at a time.
As has been said -
refrigerate your dough - I try to do a minimum of at least 30minutes (but I usually end up doing overnight, then I have to end up letting it set out for half an hour before I start cooking it LOL)
Try hydrating your raisins before mixing them -
Try a mix of raisins (golden raisins, dark raisins) - (usually things like that make for a a great / better / more memorable) cookie.
Hope this helps! Let us know how your cookies turn out :o)