Preheat oven to 350°F.
In a medium bowl, sift the flour, sugar, baking powder, and salt together. Set aside.
4 cups cake flour , 2 cups granulated sugar, 1 tablespoon baking powder, 1 teaspoon kosher salt
In the bowl of a stand mixer fitted with the paddle attachment, beat the butter until it’s smooth, about 5 minutes. Add in the vanilla and eggs.
1 cup unsalted butter, 1 teaspoon pure vanilla extract, 8 large egg whites
Switch to the whisk attachment and continue beating the mixture on medium speed for about 30-60 seconds, until foamy.
Add the flour mixture and milk, continuously mixing on low-to-medium speed until smooth and creamy.
1½ cups milk
Evenly divide the batter into three lightly buttered and floured 8-inch round cake pans (about 582 grams per pan).
Bake for 25-28 minutes, or until a toothpick inserted in the center comes out clean. Let the cakes cool in their pans for about 5 minutes, then remove and cool completely on a wire rack, about 2 hours.