INGREDIENTS
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8 1/2 ounces (2 cups, spoon and level) all-purpose flour
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3 1/2 ounces (1 cup) natural cocoa powder, sifted
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2 1/2 teaspoons baking powder
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1/2 teaspoon baking soda
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1/2 teaspoon salt
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2 eggs plus 1 egg yolk
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8 3/4 ounces (1 1/4 cups) granulated sugar
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3 7/8 ounces (1/2 cup) canola or vegetable oil
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12 3/4 ounces (1 1/2 cups) sour cream
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1 tablespoon vanilla extract
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10 1/2 ounces chocolate chips and/or chopped chocolate, divided*
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sparkling sugar, for tops