Ingredients
- 8 tablespoons (1 stick) unsalted butter, at room temperature, plus more for buttering the pan
- 1 1/4 cups all-purpose flour, plus more for dusting the pan
- 2 tablespoons unsweetened cocoa powder (not Dutch process)
- 1/2 teaspoon baking soda
- 1/4 teaspoon fine salt
- 3/4 cup sugar
- 2 tablespoons vegetable oil
- 1 large egg, at room temperature
- 1 teaspoon pure vanilla extract
- 1/4 cup buttermilk, at room temperature
- 1 cup shredded zucchini (about 8 ounces)
- 2 ounces semisweet chocolate, finely chopped
- One 1/4-inch-thick lengthwise slice zucchini, for garnish
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