1. Preheat the oven to 350°F.
2. Melt the chocolate in a double boiler. Add the butter, stirring until smooth.
3. In a bowl, whisk the eggs and coffee.
4. Add the sugar, flour, and melted chocolate, stirring without stopping.
5. Grease the mold and fill with batter.
6. Bake for 10 minutes.
7. Remove from the oven and let cool on a rack.
8. Using a mixer, whip the cream and sugar until stiff peaks form.
9. Top the cake with the whipped cream, decorate with powdered chocolate, and serve.