Preheat oven to 425°F. Grease 4 ramekins and dust lightly with cocoa powder.
Melt chocolate and butter together in a double boiler or microwave. Stir until smooth.
In a separate bowl, whisk eggs, yolks, sweetener, and vanilla until pale and fluffy.
Fold melted chocolate into the egg mixture.
Gently stir in almond flour, cocoa powder, and salt until combined.
Divide batter evenly among ramekins.
Bake 10–12 minutes, until edges are set but centers remain soft.
Let cool 1–2 minutes, then carefully invert onto plates. Serve immediately.