INGREDIENTS
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3/4 cup whole milk
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1/3 cup canola oil
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1 large egg
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1 teaspoon vanilla extract
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3/4 cup granulated sugar
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1 cup all-purpose flour
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1/3 cup dark or dutch process cocoa powder
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3/4 teaspoon baking powder
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1/2 teaspoon baking soda
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1/4 teaspoon kosher salt
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1/8 teaspoon cinnamon
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8 ounces good quality white chocolate, finely chopped*
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1/3 cup heavy cream, plus more as needed
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1/2 cup (1 stick) unsalted butter, room temperature
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1 1/4 cups powdered sugar, sifted, plus more as needed