"Orange zest is a great way to capture the intense flavor of orange without adding too much liquid or bulk to a recipe. Use a zesting tool or rasp to remove the outermost layer of the orange. Avoid the white pith as it tends to be bitter...."
INGREDIENTS
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For the crumbs:
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8 tablespoons (1 stick) unsalted butter
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1/3 cup dark brown sugar
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1/4 cup sugar
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1 1/2 teaspoons ground cinnamon
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1/4 teaspoon salt
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1 1/4 cup all-purpose flour
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For the cake:
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1 cup all-purpose flour
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1/2 teaspoon baking soda
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1/2 teaspoon baking powder
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1/4 teaspoon salt
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5 tablespoons unsalted butter, at room temperature
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1/2 cup sugar
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1 teaspoon pure vanilla extract
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1 large egg, at room temperature
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1/2 cup sour cream
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1 tablespoon orange zest
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1 cup fresh or frozen cranberries