Preheat oven to 425 degrees F. Liberally grease 4 baking dishes or ramekins.

In a microwaveable bowl, melt together the chocolate and butter on HIGH for 1 minute or until chocolate is smooth and butter has melted. Whisk the chocolate until mixture has combined and is smooth and glossy.

Add in the powdered sugar, eggs, egg yolks and vanilla, stirring to combine. Lastly, add in the flour and pinch of salt until a thick batter forms.

Portion the batter evenly among the ramekins and bake for approx. 13-15 minutes or until the edges are firm and set but the center is still soft. Let the cakes stand for about 2 minutes before carefully running a knife along the edge of the ramekin and releasing the cake gently onto a plate. Top with ice cream and chocolate sauce, if desired. Serve immediately.