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Preheat the oven to 350F.
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Grease and flour a tube pan.
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Blend together butter, sugar and vanilla, then add the eggs, one at a time.
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Mix the flour, salt, and baking powder in another bowl and add to wet ingredients, one spoon at a time, alternating with the sour cream.
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Mix together topping ingredients and divide into halves.
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Pour about 2/3 of the cake batter into the pan and sprinkle half of the topping mixture over it.
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Pour the rest of the batter into the pan and then sprinkle the remaining topping mixture.
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Bake about 1 hour and 15 minutes.
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Cool before removing from pan.