Preheat your oven at 350F
Prepare your bowls: You will need four bowls—one for dry ingredients, one for melting chocolate in a double boiler, and one for mixing eggs, and a small one for mixing cocoa powder and water.
Mix dry ingredients: In the first bowl, combine the flour, salt, baking powder, and baking soda.
Beat the eggs: In the second bowl, crack the eggs and beat them with the sugar until frothy.
Melt the chocolate: In the third bowl, add the dark chocolate, yogurt, and butter. Melt this mixture over a double boiler until smooth.
In a small bowl or mug. Dissolve the cocoa powder in the boiling water and add it to the chocolate mixture.
Combine everything: Gradually mix the beaten eggs with the dry ingredients, then fold in the chocolate mixture. Important Tip: Don’t overmix the batter, as this can affect the cake's texture.
Bake: Pour the batter into two greased baking pans. Important Tip: Once the batter is done, it needs to go straight into the preheated oven at 180°C (350°F) without sitting around. Bake for about 35 minutes. After this time, test with a toothpick; if it comes out clean, the cake is ready.