INGREDIENTS
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1 cup (2 sticks) unsalted butter, at room temperature
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2/3 cup granulated sugar
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3/4 cup packed dark brown sugar (fine to substitute light)
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1 teaspoon vanilla extract
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2 large eggs
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1 teaspoon salt
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1 teaspoon baking soda
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2-1/2 cups all purpose flour, spooned into measuring cup and leveled-off with a straight edge
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6 oz bittersweet chocolate, best quality such as Ghriardelli, roughly chopped
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2 oz milk chocolate, best quality such as Ghirardelli, finely chopped