In a medium bowl, whisk flour, baking powder, cocoa powder and salt until well combined. Set aside.

Using hand mixer or stand mixer,cream butter and sugar on med-high until pale and fluffy 3 to 4 minutes Reduce speed and add eggs one at a time fully incorporating after each addition add milk then. Add vanilla.then the flour mix

Bake for about 40mins or until a toothpick inserted into the center comes out mostly clean.

For butter cream,

Place your butter in to bowl and mix until smooth add icing sugar and melted, cooled white chocolate and whip until smooth add vanilla.