Preheat the oven to 320°F (160°C).

Line a 9-inch round cake pan with parchment paper.

Separate the egg yolks from the whites.

In a large mixing bowl, whisk together the egg yolks, sugar, milk, vegetable oil, and vanilla extract until smooth.

In another bowl, sift together the flour, baking powder, and salt.

Gradually fold the dry ingredients into the wet mixture.

In a clean bowl, whip the egg whites until soft peaks form.

Gently fold the whipped egg whites into the batter.

Pour the batter into the prepared pan and bake for 30-35 minutes.

Let the cake cool in the pan for 10 minutes before transferring it to a cooling rack.