Meringue Cake with Silky Custard Buttercream

Ingredients:

For the shortbread layers:

1 cup unsalted butter, softened
1/2 cup granulated sugar
2 cups all-purpose flour
1/2 teaspoon salt
For the meringue layers:

4 large egg whites
1 cup granulated sugar
1/4 teaspoon cream of tartar
1 teaspoon vanilla extract
For the custard buttercream:

1 cup whole milk
1/4 cup granulated sugar
2 tablespoons all-purpose flour
2 large egg yolks
1 teaspoon vanilla extract
1 cup unsalted butter, softened
1/2 cup powdered sugar
Directions:
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