Remember what I said last year? It's all about the picture with the cake.
White Butter Cake:
1 3/4 cups (175 grams) sifted cake flour
2 teaspoons baking powder
1/4 teaspoon salt
1/2 cup (113 grams) unsalted butter, at room temperature
1 cup (200 grams) granulated white sugar, divided
2 large eggs, separated
1 teaspoon pure vanilla extract
1/2 cup (120 ml) milk
1/8 teaspoon cream of tartar
White Butter Cake: While eggs are still cold separate the eggs, placing the yolks in one bowl and the whites in another bowl. Cover the two bowls with plastic wrap and allow the eggs to come to room temperature before using (about 30 minutes).
In a mixing bowl sift or whisk together the flour, baking powder, and salt. Set aside.
In bowl of electric mixer, beat the butter until soft (about 1-2 minutes). Add 3/4 cup (150 grams) of the sugar and beat until light and fluffy (about 2-3 minutes). Add egg yolks, one at a time, beating after each addition. Scrape down the sides of the bowl. Add the vanilla extract and beat until combined.
With the mixer on low speed, alternately add the flour mixture and milk, in three additions, beginning and ending with the flour.
In a clean bowl of your electric mixer, with the whisk attachment, beat the egg whites until foamy. Add the cream of tartar and continue beating until soft peaks form. Gradually add the remaining 1/4 cup (50 grams) of sugar and continue to beat until stiff peaks form. With a rubber spatula gently fold a little of the whites into the batter to lighten it, and then fold in the remaining whites until combined. Do not over mix the batter or it will deflate.
Divide the batter evenly between the two prepared pans and smooth the tops with an offset spatula or the back of a spoon. Bake in the preheated oven for approximately 20 - 25 minutes, or until a toothpick inserted in the center of the cake comes out clean.
