I think maybe cookies are supposed to be soft still when you take them out? I know flapjacks come out of the oven oozy and then solidify as they cool, and I think cookies are a similar idea.
Having said that, I totally screwed up my flapjacks last week when I turned the tray halfway through and managed to tip a portion onto the oven door, so they ended up being too thin and then cleaning up messed up the timing so they also ended up undercooked, so I feel your baking pain!
It turns out they are squishier on the inside (-: Seriously need to remember not to panic so much about done-ness as my perception of done seems to be way above everyone else's.
My problem with flapjacks is that I can't get anyone casa Buzzy to eat them (this has proved a pain when it comes to all baked things - I'm down to victoria sponge and fruitcake) and they are seriously yummy.
I've been delegating getting things out to my dad just not yesterday.
It works via a elimination thing: suggest kinds of cake to different family members, each option will be a non-negotiable squick for at least one family member. So: cheese cake (3), lemon drizzle (2), anything with nuts (1), chocolate (1.5), unusual fruit (varies), flapjacks (2), brownies (2), chocky chip cookies (1)...
... wash, rinse, repeat :-(
p.s. carrot cake (2) [which is less than win] cheesecake (3)...