Preheat the oven to 3 5 0 ° F.
Measure out 4 cups of cake flour, 2 and a half cups of sugar, 2 teaspoons of salt, 4 and a half teaspoons of baking powder, a quarter of a cup of canola oil, 1 cup of unsalted butter, 6 of egg whites, 6 of eggs, 1 and a half cups of sour cream, 1 tablespoon of vanilla bean paste, and 1 tablespoon of vanilla extract.
In a small bowl, mix 1 and a half cups of sour cream, 1 tablespoon of vanilla bean paste, and 1 tablespoon of vanilla extract until combined.
Let the sour cream mixture stand for 10 minutes.
While the sour cream mixture rests, line the bottoms of three greased 9-inch round cake pans with parchment, and then grease the paper.
Sift 4 cups of cake flour, 2 and a half cups of sugar, 2 teaspoons of salt, and 4 and a half teaspoons of baking powder together, twice, into a large mixing bowl.
Add the cubed 1 cup of unsalted butter and a quarter of a cup of canola oil, and beat until the mixture looks crumbly.
Add 6 of egg whites, one at a time ( about 2 tablespoons ), beating well after each addition.
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