Best time to flatten cookies?
I did an experiment with Cook's Illustrated's chocolate chip cookies. I chilled the dough overnight and halfway through baking I flattened them with a spatula to see what happened and they turned out close to my ideal cookie shape, not too thin and with a flat surface. Normally my cookies end up either too thin, or they'd have a domed/rounded middle, especially when chilled.
I plan to experiment with this method more, and I might need to mess with the oven temperature but I'm wondering if I should change when I flatten them. I've seen some people flatten them right after baking and others flatten them before baking.
What differences would there be if I flattened them at a different time? Have any of you experimented with that?