INGREDIENTS
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2 1/4 cups (270g) all-purpose flour
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1/4 cup (35g) corn starch
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1 1/4 cup (250g) granulated sugar
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2 tsp baking powder
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1/2 tsp salt
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1/2 cup (113g) unsalted butter room temperature
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1/4 cup (60mL) vegetable oil
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3 eggs room temperature, large
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2 yolks
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1 tbsp (15mL) vanilla extract
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1 cup (240mL) buttermilk