INGREDIENTS
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Cake:
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1 cup unsalted butter
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1 cup granulated sugar
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2 eggs
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2 cups all-purpose flour
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1 teaspoon baking soda
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1 teaspoon baking powder
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1/2 teaspoon table salt
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1 teaspoon vanilla extract
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1 cup buttermilk
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Streusel Topping:
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1/3 cup brown sugar
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1/3 cup white sugar
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1 teaspoon cinnamon
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1 cup walnuts (or pecans), coarsely chopped