Lemon Cake with Creamy Filling and Lemon Curd

INGREDIENTS

egg whites, room temperature

3/4 cup

buttermilk

lemons, zested

3/4 cup

unsalted butter, softened

1 3/4 cups

granulated sugar

2 1/2 cups

cake flour

1 tbsp

baking powder

1/2 tsp

kosher salt

4 oz

unsalted butter

4 oz

cream cheese

2 cups

powdered sugar

1 cup

plus 2 Tbsp [lemon curd|https://www.shugarysweets.com/2013/02/easy-homemade-lemon-curd], divided

1/2 cup

all purpose flour

1/2 cup

powdered sugar

1/4 cup

unsalted butter, cold

1 tsp

vanilla extract