Smashburger is celebrating National Mushroom Day this year by offering Truffle Mushroom Swiss Single Burgers for $4 each on October 15, 2020.
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The Truffle Mushroom Swiss Burger features a pure beef patty topped with sautéed crimini mushrooms, aged Swiss cheese, and truffle mayo on a classic bun.
Smashburger’s National Mushroom Day promotion is valid at participating locations nationwide for one day only on Thursday, October 15, 2020.
Image – Smashburger