Preheat and prep: Preheat oven to 350°F (175°C). Line only the bottom of two 6-inch cake pans with parchment. Do not line the sides.
Make yolk batter: Whisk egg yolks, salt, and sugar until pale. Add milk, vegetable oil, and pandan extract and whisk until light and foamy. Sift in cake flour and fold until just combined.
Make meringue: Beat egg whites until foamy. Add sugar in 3 equal additions, beating between each until soft peaks form. Do not overwhip.
Fold: Add meringue to yolk batter in 3 additions — first two with a whisk, final addition with a spatula. Fold gently until no streaks remain.
Bake: Divide batter between prepared pans. Bake for 20-25 minutes until golden and a toothpick comes out with just a few moist crumbs. Immediately flip upside down and cool completely.
Remove and slice: Run a knife along the edges to release. Slice each layer into ½ inch thick sheets.