Dora wrote:

At this stage of my life I'm wondering - wouldn't just greasing
and flouring the cake tins have worked as well? Just a thought.

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Normally I wouldn't have a problem with this, Dora, but this is
for multiple batches of cookies. The baking time is about 8 or
9 minutes, and I've two sheets in the oven and two to get ready
in that time. I've got to grease the pan and spoon them out.
Then when those come out and I slam the uncooked ones in, I have
9 minutes to get those cookies off there, cool the sheet down
where it won't melt the cookies, and spoon out more cookies.
There is no way that hot soft cookies are ready to come off the
sheet instantly. Right now I'm using foil, but the parchment
paper was recommended in a recipe. I can drag the cookies
off the sheet while they are on the foil within a minute after
they come out of the oven.

Thank you for commenting, Michael