First melt the dark chocolate using the double boiling method, add white sugar and stir until melt. After a little warm, pour the butter and beat well.
Next, add the yogurt and milk mixture in portions, and pour the whole egg in portions.
Mix well, then sift in all powders and salt to the mixture.
When half of the powder is left in the batter, pour in roasted chocolate beans and mix well. Mix until there's no dry powder and pour into the mold.
Finally, sprinkle with roasted chocolate beans to decorate, and then put into the preheated oven for 25 minutes at 200 degrees.