Intensely rich dark chocolate cake is a modern Italian classic for serious chocolate lovers. This decadent mediterranean dessert is a family celebration favorite.
Preheat the oven to 350°F (175°C) and line an 8-inch springform pan with parchment paper, buttering the sides and bottom for easy release.
Melt the dark chocolate and unsalted butter together in a heatproof bowl set over simmering water, stirring gently until smooth, then remove from heat to cool slightly.
In a large mixing bowl, whisk the eggs, granulated sugar, and vanilla extract until pale and thick (about 2–3 minutes by hand or mixer on medium speed).
Fold the melted chocolate-butter mixture into the egg mixture, then gently fold in the flour and fine sea salt just until combined—do not overmix, to avoid a dense cake.
Pour the batter into the prepared pan and smooth the top. Bake in the center rack for 28–35 minutes, checking at 28 minutes: the edges should be set and the center just barely firm with a slight jiggle.
Remove the cake and let it cool in the pan for 15 minutes before releasing from the springform. Cool completely on a rack, then dust lightly with powdered sugar before serving.