Vanilla Bean Latte Layer Cake

INGREDIENTS

1 1/2 cups

(3 sticks)(341 g) unsalted butter, at room temperature

2 2/3 cups

granulated sugar

egg whites, at room temperature

4 1/2 cups

all-purpose flour

2 tbsp

baking powder

1 tsp

salt

2 cups

buttermilk, at room temperature

1 tbsp

vanilla bean paste or 1 vanilla bean, split & scraped

1 tsp

pure vanilla extract

large egg whites (180 g)

1 cup

granulated sugar

1 1/2 cups

(3 sticks)(340 g) unsalted butter, softened but cool, cut into cubes

1 tsp

pure vanilla extract

vanilla bean, split & scraped or 1 tablespoon (15 ml) vanilla bean paste

1 tbsp

instant espresso powder (or to taste) dissolved into 1 teaspoon (5 ml) boiling water

1/4 tsp

cinnamon (or to taste)

salt