120gButtermilkor sub ½ cup milk + 1 tablespoon lemon juice or vinegar
2Teaspoon vanilla bean paste
Instructions
Preheat your oven to350F (conventional setting).
Sift the flour, cornstarch, baking powder, baking soda, and salt into a bowl and mix well. Set aside.
In a separate bowl, whisk together the sugar, oil, and butter for 1-2 minutes using a hand mixer until the mixture begins to change color.
Incorporate the eggs, egg white, and vanilla, then continue whisking for an additional 1-2 minutes.
Add a third of the buttermilk and whisk to combine the wet ingredients.
Add a third of the dry ingredients and fold with a rubber spatula gently until well mixed.
Continue this process, adding the buttermilk and dry ingredients in thirds, until you have thoroughly combined everything.
Prepare your Bundt pan by brushing it generously with oil and dusting it with granulated sugar. Pour the batter into the pan.
Bake for approximately 30 minutes. The exact time may vary, so check with toothpick to ensure it comes out with moist crumbs.
Let the cake sit in the pan for 10–15 minutes before gently removing it.
Dust with powdered sugar, and serve!
Notes
The precise baking duration can differ based on your Bundt pan's type and material; start checking with a toothpick at around 25 minutes. For optimal flavor, aim to use high-quality vanilla, such as vanilla bean paste.