Would you just look at this chocolate cake! The swoop! The swirl! You might just want to lie down in that frosting. Would you still want to do so if I told you it was not a buttercream, but a brilliant combination of dark chocolate and—seriously—sweet potato purée? Watch how it's made here:
Genevieve Ko, whose book Better Baking includes this recipe, doesn't believe in sneaking in vegetables. So she'd want me to tell you. She'd also want me to tell you that there's zucchini in the cake, too. For a cake that might seem secretive, it's not sneaky:
When I bring treats to my girls’ school parties, I don’t want them to be mortified by their mom’s weird food—nor do I want to turn their classmates into hyperactive rascals with empty calories. That means something that looks familiar but tastes better than the original. Enter this easy sheet cake. Zucchini keeps the cocoa–chocolate chip cake extra moist, and sweet potato swirls into a frosting as creamy as that canned stuff, with far more flavor (and no added sugar). Dark chocolate—semisweet or a lower-percentage bittersweet—makes the cake luxurious and sophisticated enough for adults. Kids may ask about the bits of green zucchini in the cake. I’m not a believer in sneaking in veggies, so I tell them. Even if they balk, they still gobble up the cake once they take a bite or hear their friends raving. Party on!
See? Not a secret. Now, go tell everyone you know.
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