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In large mixing bowl, cream butter and sugar.
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Add eggs, one at a time, beating well after each addition.
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Combine the flour, baking powder and salt.
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Combine the sour cream and vanilla; add to creamed mixture alternately with dry ingredients.
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Combine topping ingredients; sprinkle 2 T into a greased and floured 10-inch tube pan.
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For glaze, in a microwave-safe bowl, melt chocolate chips and butter; stir until smooth.
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Spoon half of the batter over topping; sprinkle with half of the remaining topping.
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Drizzle with half of the glaze.
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Top with remaining batter; sprinkle with remaining topping.
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Bake at 350 degrees for 60-70 minutes or until toothpick inserted comes out clean.
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Cool for 10 minutes before removing from pan to a wire rack.
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Warm remaining glaze; drizzle over coffee cake.
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Serve warm, if desired.