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1.
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Make the streusel topping: Mix together flour, 3/4 cup brown sugar, 1 teaspoon cinnamon, and 1 teaspoon salt.
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Cut in butter using a pastry cutter or rub in with your fingers until small to medium clumps form.
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Mix in 1/2 cup pecans.
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Refrigerate until ready to use.
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2.
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Make the streusel center: Mix together remaining 1/4 cup brown sugar, 1/4 teaspoon cinnamon, and 1 cup pecans.
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3.
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Preheat oven to 350.
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Make the cake: Butter a 9-inch tube pan with a removable bottom.
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Sift flour, baking powder, baking soda, and 1/2 teaspoon salt into a bowl.
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4.
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Beat butter and granulated sugar with a mixer on medium speed until pale and fluffy, about 2 minutes.
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Beat in eggs, 1 at a time, then vanilla.
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Beat in flour mixture in 3 additions, alternating with sour cream, beginning and ending with flour.
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Continue to beat until well combined.
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5.
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Spoon half the batter into pan.Sprinkle streusel-center mixture evenly over batter.
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Top with remaining batter, and spread evenly using an offset spatula.
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Sprinkle streusel-topping mixture evenly over batter.
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6.
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Bake until cake is golden brown and a toothpick inserted into the center comes out clean, about 55 minutes.
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Transfer pan to a wire rack, and let cool completely.
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Remove cake from pan, and transfer to parchment.
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7. make the glaze: Mix together confectioners' sugar and milk.
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Drizzle over cake, and let drip down sides.
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let set for 5 minutes before serving.
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STORAGE.
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Coffee cake can be stored at room temperature for up to 5 days.