Preheat the oven to 350 degrees Fahrenheit. Grease a 9x13 baking pan, and set aside.
In a small bowl, sift in the flour, baking powder, baking soda, and salt. Set aside.
In a stand mixer, add the egg yolks, and 3/4 cup of the sugar. Beat them together until the egg yolks are a pale yellow and double in size, about 2 minutes.
Add in the milk, and vanilla extract, and stir them into the egg yolks on low speed.
Add the flour mixture into the egg yolks and fold them together until combined.
Clean out the stand mixer bowl completely, or use another large bowl and beat the egg whites and remaining 1/4 cup of sugar for about 4 minutes, or until you have stiff peaks.
Add half the egg whites to the flour mixture and fold them together. Then add the other half and carefully fold them together until you have no streaks of egg white.
Pour the batter into the prepared baking pan.
Bake the cake for 18 to 22 minutes. until a toothpick comes out clean.
Cool the cake for 30 minutes.
Poke the top of the cake all over with a wooden bamboo skewer.