Preheat your oven to 350°F (175°C). Line a muffin pan with 6 cupcake liners and set it aside.
In a large bowl, whisk together the cake flour, baking powder, and salt. Set it aside.
76 grams (1/2 cup + 2 tablespoons) Cake flour, 1 teaspoon Baking powder, 1/4 teaspoon Salt
Using a hand mixer or stand mixer, cream the butter and sugar together for about 5 minutes, or until the mixture looks pale and fluffy. Add in the oil, vanilla extract, vanilla bean paste, the egg, and the egg white. Mix on medium speed for 2 minutes to add air to the batter.
42 grams (3 tablespoons) Unsalted butter,, 72 grams (1/4 cup + 2 tablespoons) Granulated sugar, 1 tablespoon Canola oil (or any neutral oil), 1 1/4 teaspoon Vanilla extract, 1 Large egg,, 1 Egg white,, * optional 1 teaspoon Vanilla bean paste
Add half of the dry ingredients and gently fold it in using a spatula. Then add half of the buttermilk and mix again. Add the remaining dry ingredients and buttermilk, mixing just until everything is combined. Don’t overmix—stop once the flour streaks disappear.
48 grams (1/4 cup) Buttermilk,
Divide the batter evenly into 6 cupcake liners in a muffin pan. Bake at 350°F (175°C) for 15 to 18 minutes, or until a toothpick inserted in the center comes out clean. Let the cupcakes cool in the pan for 5 minutes, then transfer to a wire rack to cool completely before frosting.