Step 1

Preheat oven to 180C/160C fan-forced. Grease and line the base and sides of a 19cm square cake pan.

Step 2

Using an electric mixer, beat eggs and sugar in a small bowl until pale and creamy. Add vanilla. Transfer to a large bowl.

Step 3

Sift cocoa and flour over egg mixture. Fold into egg mixture until nearly combined. Stir in milk and oil until combined. Spoon mixture into prepared pan. Smooth surface.

Step 4

Bake for 35-40 minutes or until a skewer inserted into the centre comes out clean. Stand in pan for 5 minutes. Turn onto a wire rack to cool. Dust with extra cocoa powder to serve.