• prep: 30 min
• cook: 0 hr
• total: 30 min

servings:

Two types of chocolate -- semisweet and cocoa powder -- give this loaf its rich flavor.

• 1 stick unsalted butter, melted and cooled, plus more for pan
• 2 cups unbleached all-purpose flour, plus more for pan
• 1 3/4 cups granulated sugar
• 1/4 cup unsweetened cocoa powder
• 2 1/4 teaspoons baking powder
• 1 1/2 teaspoons kosher salt
• 1/2 teaspoon baking soda
• 4 large eggs, beaten
• 2 teaspoons pure vanilla extract
• 3 cups coarsely grated zucchini (from 1 pound)
• 5 ounces semisweet chocolate, chopped (1 cup)
• 1 1/4 cups confectioners' sugar
• 1 to 2 tablespoons whole milk
• 1 teaspoon poppy seeds

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