INGREDIENTS
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1 stick unsalted butter (plus 1 tablespoon to grease pan)
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1/3 cup Dutch process unsweetened cocoa powder (plus additional for dusting pan)
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1 cup flour
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3/4 teaspoon baking powder
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1 teaspoon Kosher salt
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2/3 cup light brown sugar
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2 large eggs (plus 1 egg yolk)
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2 teaspoons vanilla extract
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1/3 cup buttermilk
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1/4 cup sour cream
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TO ASSEMBLE:
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cooking spray (to grease)
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3 pints butter pecan ice cream (removed from container, sliced into 1-inch thick rounds)
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1/2 cup pecans (toasted, chopped, to garnish)
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CHOCOLATE GANACHE:
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3 tablespoons corn syrup
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6 ounces heavy cream
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12 ounces bittersweet chocolate (chopped into small bits)
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1/2 teaspoon vanilla extract