This week on the podcast, we bring you the fourth and final episode of our miniseries where we reveal the backstories behind four iconic recipes from America's Test Kitchen's TV show, which is celebrating its 25th season on air.

We saved the sweetest for last. Episode 4 follows one test cook's dogged pursuit for the perfect, chewy brownie recipe.

Looking for more recipes that changed the way America cooks? Check out our 25th Anniversary Cookbook.

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ATK at 25: Reverse-Engineering the Boxed Brownie (Episode 4)