INGREDIENTS
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FOR WHITE CAKE:
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1 cup whole milk, room temperature
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6 large egg whites, room temperature
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2 teaspoons vanilla extract
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2 1/4 cups cake flour
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1 3/4 cups granulated sugar
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4 teaspoons baking powder
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1 teaspoon salt
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12 tablespoons unsalted butter cut into 24 pieces, softened but still cool
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FOR CRUMB TOPPING:
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1/2 cup + 1 Tablespoon all-purpose flour
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1/2 cup + 2 Tablespoons powdered sugar
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1/2 Tablespoon finely grated lemon zest
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4 tablespoons butter cut into 8 pieces, softened
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1/2 teaspoon vanilla extract
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FOR FILLING:
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1 cup heavy cream
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8 oz. container mascarpone cheese, softened
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2 cups powdered sugar
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3 Tablespoons lemon juice
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1/2 Tablespoon finely grated lemon zest
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FOR GARNISH:
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Sifted powdered sugar