"This classic coffee cake uses the same sweet, crumbly mixture in the batter and as a topping to intensify this dessert's cinnamon-sugar flavor...."
INGREDIENTS
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2 all-purpose flour
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1/2 kosher salt
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1 ground cinnamon
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2 baking powder
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3/4 packed brown sugar
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1/2 cold unsalted butter
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1/2 walnuts
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1 egg
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1/2 cold coffee