INGREDIENTS
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2¼ cups all-purpose flour
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2½ Tbsp cocoa powder
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1½ tsp cornstarch
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¾ tsp baking soda
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½ tsp salt
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8 Tbsp butter, at room temperature
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6 Tbsp all vegetable shortening
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1½ cups granulated sugar
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1 large egg
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1 large egg yolk
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1½ tsp white vinegar
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1½ tsp vanilla extract
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1 Tbsp red food coloring
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1⅓ cups white chocolate chips, divided