Mix the matcha powder with the flour and baking powder.
Break the oreo cookies into small pieces and mix with the matcha flour. Leave aside.
Warm up and soften the butter in a microwave for about 20 seconds.
Add the sugar and eggs with the butter. Mix well.
Add the heavy cream with the buttercream and mix.
Add all the dry ingredients with the buttercream and mix.
Put the filling in a pound cake mold and bake it in a preheated overn at 180℃ or 350゜F for about 30minutes.
If the cake if still undercooked, bake it for another 5-10 minutes.
Cool down the cake at room temperature.
Cut into individual pieces and serve.