"Baking these brownies in a preheated cast-iron skillet gives them a crunchy crust...."
INGREDIENTS
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1 cup plus 2 tablespoons unsalted butter
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4 ounces unsweetened chocolate, chopped
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2 cups sugar
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1½ cups firmly packed light brown sugar
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5 large eggs
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1 tablespoon vanilla extract
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1⅔ cups all-purpose flour
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⅛ teaspoon kosher salt
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1 cup butterscotch morsels
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1 cup semisweet chocolate morsels
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1 cup toasted pecans, chopped
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Vanilla ice cream, to serve