Using the oven function of your Panasonic Convection Microwave Oven, preheat to 180°C.
Add all dry ingredients to a large mixing bowl. Whisk until there are no lumps. Add all the wet ingredients and whisk until as smooth as possible.
Pour the batter into a lined 20cm cake tin. Bake for 1 hour or until a skewer comes out clean. Cover the cake with a tray or foil if the top is cooking too quickly.
Allow the cake to cool to room temperature, then further cool in the fridge.
To make the frosting, add all ingredients to a saucepan and melt completely. Chill the ganache in the fridge until firm.
Using an electric beater or a stand mixer, beat the ganache until light and fluffy.
Top your cake with the frosting. Enjoy immediately or store in an airtight container in the fridge for up to 3 days.