Mushroom Swiss lovers, this is NOT a drill 🚨To celebrate Mushroom Day, from Oct 12–17, score 1-for-1 on Burger King’s iconic Mushroom Swiss burgers with THREE options to pick from: - Mushroom Swiss Croissan’wich® with Egg, Code: SHROOM11 (breakfast only) - Single Mushroom Swiss, Code: SHROOM22 (lunch & dinner) - Mushroom Swiss Tendergrill®, Code: SHROOM33 (lunch & dinner) Treat yourself. And your bestie. Or just treat yourself twice.

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Enjoy 1-for-1 Mushroom Swiss burgers!

Start

12 Oct 2025

End

17 Oct 2025

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