Pre-heat oven to 180C / 360F. Lightly grease and line an 9" cake tin (a spring form tin is easiest).
Add almonds to Thermomix bowl. Mill them for 10 seconds / speed 8. Set aside.
Break up the chocolate and add to the bowl with the chopped up butter. Melt for 4 minutes / 50 degrees / speed 2.
Add sugar. Mix for 10 seconds / speed 4.
Add eggs and vanilla. Mix for 5 seconds / speed 4.
Add the cocoa powder, baking powder and ground almonds. Mix for 30 seconds / speed 4.
Transfer cake batter to the cake tin and bake in the oven for 45 minutes or until a knife inserted comes away clean.
Allow to cool in tin for 15 minutes, then remove outer sides of the pan and let it cool completely before removing the base. (If not using a spring form tin then allow to cool completely in tin).
Dust with cocoa powder and/or icing sugar to serve. Best served with whipped cream or ice cream and strawberries or raspberries.
Notes
Almonds - you can use raw or roasted, or replace with almond meal.