Easy as fuck, super quick and always turns out good. Enjoy

200g butter

3/4 cup cocoa

4 eggs

2 cups white sugar

1 tsp vanilla essence

3/4 cup flour

1 tsp baking powder

Melt butter add cocoa. Mix together. Add 4 eggs mixing together, add sugar and vanilla essence. Mix together with flour and baking powder. Put in a baking tray and bake at 180°C for approx 30-50 mins.