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Welcome to the Bon Appétit Bake Club, a community for inquisitive bakers. Every month, senior Test Kitchen editors Jesse Szewczyk and Shilpa Uskokovic feature a must-make recipe and explore in depth why it succeeds. Join us for baking and learning fun—and be sure to hop into the Bake Club Group chat on Substack. Chocolate and malt are a match made in heaven. If you’ve ever tried malted chocolate cake or brownies, you get what I mean. But it’s not the easiest task to find malted milk powder in stores. It’s often concealed in an instant drink mix, blended with chocolate to make it resemble malt, though it’s not. But Guinness is easy to find—and an ingredient that delivers a ton of robust, malty flavor. Thus, this chocolate and Guinness loaf cake came into being.