Preheat the oven on 350f

Mix eggs, sugar, and vanilla in a bowl(bowl 1)

In a different bowl (bowl 2)mix the flour and baking powder

Add 1/2 cup water and powder milk to bowl 1

Slowly add bowl 2 into bowl 1 and mix

Take a quarter of the mixture into a different bowl and add cocoa and 2 tablespoons of water

Spray the cake pan and pour both mixtures in

Use a knife to make a design on the mix(optional)

Cook it in the oven for 40 minutes(sometimes it depends if the pan if smaller or bigger)

As the cake cooks melt the chocolate(optional)

When the cake is done enjoy (if you decided to use chocolate put the chocolate on the cake)