INGREDIENTS
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1 cup cocoa powder, sifted, plus more for dusting pan
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7 1/2 oz. semisweet chocolate, finely chopped
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1 cup boiling water
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2 1/4 cups all-purpose flour
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1 1/2 tsp. baking soda
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1 1/4 tsp. kosher salt
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20 Tbsp. (2 1/2 sticks) unsalted butter
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2 1/2 cups firmly packed light brown sugar
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5 eggs, lightly beaten
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4 tsp. vanilla extract
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1 1/2 cups sour cream
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1 1/2 cups semisweet chocolate chips
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For the ganache:
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6 oz. semisweet chocolate, finely chopped
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2 Tbsp. unsalted butter
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1/2 cup heavy cream
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