INGREDIENTS
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Cake:
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1 Cup sugar
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1 Stick unsalted butter, at room temperature
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2 Eggs
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1 Teaspoon vanilla
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1 Cup sour cream
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2 Cups all purpose flour
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2 Teaspoons baking powder
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1/2 Teaspoon baking soda
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1 Teaspoon salt
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1 Cup semi-sweet chocolate chips
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Crumb Topping:
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1/2 Cup sugar
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1 1/4 Cup all purpose flour
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1/4 Teaspoon salt
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1 Stick unsalted butter, melted
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Chocolate Sauce:
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1/3 Cup chocolate chips
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2 Tablespoons unsalted butter