"For this sour cream coffee cake, a cinnamon walnut filling swirls through a tender, buttery crumb cake enriched with sour cream...."
INGREDIENTS
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1 cup plus 2 tablespoons walnut halves
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3 packed tablespoons brown sugar
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2 teaspoons ground cinnamon
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2 cups granulated sugar
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2 sticks (8 oz) unsalted butter (room temperature)
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3 large eggs
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3/4 cup plus 3 tablespoons full fat sour cream
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1 1/2 teaspoons vanilla extract
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2 1/3 cups all-purpose flour
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1/2 teaspoon baking soda
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1 teaspoon sea salt