Truffle Mushroom Swiss Burger is $4 at Smashburger on October 15, 2020

To commemorate National Mushroom Day, Smashburger will be discounting their Truffle Mushroom Swiss Single Burger to $4 on October 15, 2020.

The Truffle Mushroom Single Swiss Burger features a grilled beef patty, aged Swiss cheese, sauteed crimini mushrooms, and truffle mayo on a toasted classic bun. In normally, goes for about $6 or so.

Photo via Smashburger.

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