Preheat oven to 170C ( Conventional oven). line two 25 x 25 cm square pan with baking paper.
In a cake mixer (stand or handheld mixer) Place the soften butter and sugar in the mixing bowl and mix well on high speed until creamy
Add in the eggs one by one until fully incorporated
Add vanilla, oil and mix well
Reduce the speed and fold in the sifted flour and baking powder
Finally, add milk and mix until fully incorporated
Add batter to the prepared tray and bake in the oven for 35-40 minutes
Take it out of the cake pans and let it cool on a wire rack
Once cool down, cut into square pieces and enjoy.