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For the cake: – 1 cup plus 2 tablespoons (143 grams) all-purpose flour, measured correctly – 1/2 cup (43 grams) unsweetened cocoa, measured correctly – 1 cup (200 grams) light brown sugar – 1 teaspoon salt – 1 teaspoon baking soda – 4 tablespoons (57 grams) unsalted butter, melted – 1/4 cup fresh vegetable oil – 1/2 cup (120 grams) full fat sour cream or plain whole milk yogurt, at room temperature – 2 large eggs plus 1 egg yolk, at room temperature – 2 teaspoons vanilla extract – 1 cup (136 grams) shredded zucchini, from about 1 medium zucchini – 1 cup (170 grams) semisweet chocolate chip For the icing: – 1/2 cup (63 grams) powdered sugar, sifted – 1 tablespoon milk
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