INGREDIENTS
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2 cups sugar
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4 ounces unsweetened chocolate
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1/4 pound unsalted butter (1 stick), plus more for greasing the pan
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2 cups all-purpose flour, plus more for dusting the pan
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2 teaspoons baking soda
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1 teaspoon baking powder
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1 teaspoon sea salt
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1 cup milk
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1 teaspoon cider vinegar
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2 eggs
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1 teaspoon vanilla
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1 1/2 cup Nestle’s semisweet chocolate chip
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1 1/2 cup sour cream, at room temperature