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Sad_Refuse3472 posted on r/baking2w
Most commercial bakeries aren't going to give out their exact recipes of their signature items. That invites competition. But a few have released cookbooks with at least close-ish approximations. https://levainbakery.com/products/30th-anniversary-book https://www.rizzoliusa.com/book/9780847834082/ https://www.amazon.com/Complete-Magnolia-Bakery-Cookbook-World-Famous/dp/1439175640 https://www.nypl.org/blog/2015/12/17/nyc-bakery-cookbooks