Vanilla sponge cake

Here is simple and easy recipe of vanilla sponge cake
Ingredients:
5 Eggs, separated
3/4 cup (150g) Sugar
Pinch Salt
1 tablespoon Vanilla extract
1 cup + 2 Tbsp. (150g) All-purpose flour
3 tablespoons Milk
3 tablespoons Oil

Directions:
1. Preheat oven to 340F (170C). Grease the bottom and sides of a 8-inch (20cm) round cake pan. Set aside.
2. In a large bowl beat the egg whites with a pinch of salt until foamy, then gradually add sugar, until stiff peak form.
3. Add egg yolks and whisk until combined.
4. Sift in flour and gently fold until combined.
5. In a small bowl whisk milk, oil and vanilla extract. Add 1-2 tablespoons from the cake batter and mix until combined. Pour into the cake mixture, gently whisk until combined.
6. Pour the batter into prepared pan, tap the pan on the table to release air bubbles and bake for 30-35 minutes.
7. Allow to cool.