Finely chop the almonds in a food processor and set aside.

Melt the chocolate and butter together in a double boiler. Add the eggs, chopped almonds, and baking powder, and mix well.

Grease a 9-inch (24 cm) round cake pan, pour in the batter, and bake in a convection oven at 350°F (180°C) for 45 minutes.

When done, remove the cake from the oven and let it cool. Place the cake on a serving platter and dust with powdered sugar.