INGREDIENTS
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1-1/2 cups (3 sticks)(341 g) unsalted butter, at room temperature
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2-2/3 cups (540 g) granulated sugar
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9 (275 g) egg whites, at room temperature
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4-1/2 cups (570 g) all-purpose flour
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2 tablespoons (22 g) baking powder
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1 teaspoon (6 g) salt
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2 cups (480 ml) buttermilk, at room temperature
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1 tablespoon (15 ml) vanilla bean paste or 1 vanilla bean, split & scraped
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1 teaspoon (5 ml) pure vanilla extract
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Buttercream
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6 large egg whites (180 g)
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1 cup (200 g) granulated sugar
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1-1/2 cups (3 sticks)(340 g) unsalted butter, softened but cool, cut into cubes
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1 teaspoon (5 ml) pure vanilla extract
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1 vanilla bean, split & scraped or 1 tablespoon (15 ml) vanilla bean paste
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1 tablespoon (15 g) instant espresso powder (or to taste) dissolved into 1 teaspoon (5 ml) boiling water
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1/4 teaspoon (1.5 g) cinnamon (or to taste)
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Pinch of salt