1. Preheat the oven to 350°F.2. Melt the chocolate and butter in a double boiler.3. Remove from heat. Add sugar, eggs, champagne, and salt.4. Add flour and mix.5. Pour into the mold and insert the 70% chocolate chips.6. Bake for 15 minutes.7. Let rest for 5 minutes in the turned-off oven.8. Remove from the oven and let cool to room temperature. Refrigerate for 1 hour.9. Remove from the refrigerator.10. Unmold, cut into individual portions, and serve.