INGREDIENTS
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2 1/4 cups all-purpose flour
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2 1/2 Tablespoons cocoa powder
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1 1/2 teaspoons cornstarch
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3/4 teaspoon baking soda
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1/2 teaspoon salt
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7 Tablespoons butter, at room temperature
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6 Tablespoons vegetable shortening, at room temperature
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1 1/2 cups granulated sugar
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1 large egg
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1 large egg yolk
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1 teaspoon white vinegar
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1 1/2 teaspoons vanilla extract
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1 Tablespoon red food coloring
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1 1/3 cups white chocolate chips, divided