Here's Who Likely Makes Jersey Mike's Beloved Brownies - Tasting Table
Briefly

Jersey Mike's is renowned for its sub sandwiches and also offers a popular chocolate chip brownie. Fans have speculated about its origin, with employees claiming that the brownies are sourced from David's Cookies. This is supported by a general manager's confirmation and similar packaging that shows identical nutrition facts to David's brownies. The ingredients lists are nearly the same, with slight variances in labeling. Despite lack of official confirmation from Jersey Mike's, employee insights and packaging evidence bolster this claim.
According to Jersey Mike's employees online, the chain's brownies likely come from David's Cookies. A general manager replied to confirm the brownies are also from David's.
The packaging for Jersey Mike's brownies provides the nutrition facts for the dessert, and this is identical to the nutrition facts for the chocolate chip brownies from David's Cookies.
Since the company itself has never put out a statement confirming this, it's impossible to know for sure. However, there is a bit more evidence than just online comments.
Other proof that David's Cookies provides Jersey Mike's brownies includes similar ingredients lists, with minor differences in phrasing, such as margarine versus a vegetable oil blend.
Read at Tasting Table
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