The debate about "slices/bars/cookies" just goes to demonstrate how much of a global village we now are... "dessert" is just a course served after the main event .. excepting of course, the plethora of "dessert specialist" cafes & restaurants that have popped up over the last 15 years...
As that marvellous research tool (google) demonstrates the word "dessert" originated from the French word desservir "to clean the table" and the negative of the Latin word servire; "Cookie" originally derived from the Dutch word koekje meaning little cake...
Afternoon tea/dessert seem appropriate for cookies, bars, and slices..
And of course, some dessert items can also be breakfast items!
The "rules" of EYBs indexing allow for some consistency when "coding" is being done internationally, usually based on training whilst a member indexer.. and yes Sydney does a marvellous job of making sure we get it as right as possible as we learn the coding manual!! And Deborah keeps us on track/target in pro-indexing.
True it is that consistency amongst coders isn't always demonstrated - it might depend on the rules that applied at the time the item was originally coded, how much attention is paid to reading the blurb around recipes/chapters in the book/magazine/blog, & how much attention is paid to proof-reading.
But it's a fun way to reconnect with books and magazines that may have lain dormant for a while!!