INGREDIENTS
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Nonstick vegetable oil spray
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all-purpose flour
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unsweetened cocoa powder
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malted milk powder
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kosher salt
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baking soda
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baking powder
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large eggs
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large egg yolk
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plus 2 tablespoons granulated sugar
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buttermilk
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vegetable oil
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vanilla extract
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coffee, cooled, divided
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light brown sugar
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bittersweet chocolate, chopped
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vanilla extract
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heavy cream
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malted milk powder
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kosher salt
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Chocolate pearls; coarsely chopped malt balls (for serving; optional)