Cake
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8 tablespoons (113g) unsalted butter, at room temperature, at least 65°F
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1 3/4 cups (347g) King Arthur Baker’s Special Sugar*
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1/4 cup (50g) vegetable oil
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2 teaspoons baking powder
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3/4 teaspoon table salt
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3 tablespoons (21g) King Arthur Bread and Cake Enhancer, optional
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2 teaspoons King Arthur Pure Vanilla Extract
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4 large egg whites plus 1 whole large egg, at room temperature
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2 3/4 cups (330g) King Arthur Unbleached Cake Flour
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1 1/2 cups (340g) full-fat plain, vanilla, or lemon yogurt, or whole milk, at room temperature
Filling & Frosting
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1/2 cup (57g) Quick-and-Easy Pastry Cream Mix*
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2/3 cup (152g) milk
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1 1/2 cups (405g) prepared lemon curd*
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2 cups (454g) whipping cream or heavy cream
*Also known as superfine or castor sugar.