Preheat your oven to 175°C and grease an 8-inch cake tin.
Melt the butter and allow it to cool slightly.
In a mixing bowl, whisk together the melted butter, sugar, eggs, and vanilla extract.
Gently fold in the cocoa powder, flour, and salt until just combined.
Pour the batter into the prepared cake tin.
Bake for 18 to 22 minutes, until the edges are set but the center remains soft and gooey.
Serve slices with whipped cream and fresh berries.
