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Kit Kat lovers, prepare to have your minds blown: that creamy filling between the crispy wafers of the classic chocolate bar isn't just plain chocolate.

Yup, we're questioning everything we've ever known, too.

There's definitely some chocolate in there, but a BBC documentary revealed that the inside layers of the bar are actually made of ... wait for it .. .ground-up Kit Kats!

This is so meta.

Thinking about that is sure to unleash some chicken-and-egg confusion: What, then, were the creamy layers of the original Kit Kat bar made from?

The documentary originally aired during a 2015 episode of BBC Two's "Inside the Factory," but the ground-up Kit Kat business came to light recently during a re-run of the episode, when a fan tweeted, "Wait, the filling is ground-up Kit Kat?"

Kit Kat bars comes in a variety of flavors, including dark and white chocolate. Amazon / Amazon

Along the production line, a worker in the video explains that a pile of broken-up chocolate bars will next be going into "re-work, where they're used for fillings for the wafer."

It's well known that British chocolates don't always taste like their U.S. counterparts, and it's important to note that the BBC Two documentary was filmed in the York factory in the U.K., which is run by Nestlé, while Hershey produces Kit Kats in the United States.

And chocolate makers are as famously tight-lipped as Willy Wonka himself.

"While we make and sell Kit Kat bars in the U.S. under a global license from Nestlé, the manufacturing process for Kit Kat is proprietary under this license," a Hershey spokesperson told TODAY Food. The spokesperson then rerouted us back to Nestlé.

"To clarify, the 'chocolayer' — the filling between the wafer of a Kit Kat — is made from cocoa liquor, sugar and a small amount of re-worked Kit Kat," a Nestlé U.K. spokesperson confirmed, adding, "Please note, re-worked Kit Kat is product which cannot be sold."

While a small number of broken Kit Kats are destined to be ground-up Kit Kat filling, the likelihood that all Kit Kat layers are made entirely from other Kit Kats did seem unlikely. After all, approximately 192 million Kit Kat bars are sold in the United States alone every year, according to the Symphony IRI Group.

While the label doesn't break down which ingredients are used for the chocolate and which are for the wafers, the wheat flour and yeast are the critical components here, and that some of the broken Kit Kats may be layered in between with the wafers, along with the melted chocolate and sugar.

And now today, there are a plethora of different Kit Kats available, like the ruby chocolate variety.

But what's the real answer to that chicken-and-egg question about the ingredients that went into the first bar?

"For the very first batch, it would not have included re-worked Kit Kats," the spokesperson said, which, of course, makes sense.

Kit Kat Candy Bars, $20, Amazon