Preheat oven to 180C/350F.
In a bowl, add your chocolate with the melted butter and oil. Stir until the chocolate is melted. You could also microwave the mixture 10 seconds at a time until the chocolate is fully melted. Set aside.
In a separate bowl. beat together your eggs and sugar until fluffy and the sugar is fully dissolved (roughly 5 minutes on high). Add in the chocolate oil mixture and stir.
Add in the flour and sift in the matcha powder. Whisk until just combined. Transfer mixture into a lined baking tin and bake for 15-20 minutes or until a toothpick comes out 80% dry.
Cut and serve.