"If the sides aren't perfectly glazed, press in chocolate shavings for an easy cover-up...."
INGREDIENTS
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3/4 cup (1 1/2 sticks) unsalted butter, room temperature, plus more for pan
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3/4 cup unsweetened cocoa powder, plus more for pan
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3/4 cup all-purpose flour
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1/2 teaspoon baking powder
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1/4 teaspoon salt
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1 cup sugar
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3 large eggs
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1 teaspoon pure vanilla extract
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1/2 cup sour cream
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Chocolate Glaze
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Sweetened whipped cream, for serving (optional)
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Chocolate shavings, for serving (optional)