'flapjack' is a correct and usable word in written English.
You can use it to refer to a flat, round cake made of oats, syrup and butter, usually served as a snack or dessert. For example, "My mom made a delicious batch of homemade flapjacks for breakfast this morning."
Dictionary
flapjack
noun
A pancake.
Exact(47)
For example, flapjacks do so well in the US (where we've just opened up a massive fulfillment depot), so our Wiltshire flapjack supplier benefits from our success.
Traditionally, if you were going to make a protein bar, you'd make the flapjack and the protein would get thrown in as an after-thought.
He was ushered in and given a cup of tea and a flapjack.
She bites her bottom lip when she's turned on She makes flapjack".
Elsewhere he likened the forthcoming journey to "going to the gym for 10 hours every day with a five-minute break every hour for a flapjack, energy bar or some nuts".
This time of year ushers in countless "survive the fringe" guides – even bouncy 20-year-olds are likely to leave Edinburgh feeling broken after too many late nights, pints in plastic cups, and a diet of flapjack and Red Bull.
Similar(13)
Pickles, Clarke et al, she surely concluded, are classic flapjack-lovers.
Was it just a year later that adopters of the inflated bowler, fedora or toque traded in those zany styles for the comparatively tame, plain-as-a-flapjack beret?
And what about those trademark Martin feet, elongated-flapjack affairs that bend forward so jauntily at the toes?
There's a lot more to oats in baking than flapjacks.
Last week, I'm very reliably informed, she produced a particularly large batch of flapjacks and, unable to feed them to her family fast enough, gave them to her husband as a treat for his hungry cabinet colleagues.
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Since I tried Ludwig back in 2017, I have been constantly using it in both editing and translation. Ever since, I suggest it to my translators at ProSciEditing.

Justyna Jupowicz-Kozak
CEO of Professional Science Editing for Scientists @ prosciediting.com