Preparation: 15 minutes
Cooking: 10 minutes
Chilling: 2 hours
Butter a microwave-safe Pyrex pie dish or baking dish.
In a bowl, whisk the whole eggs with the sugar until foamy and pale. Gradually add the flour while whisking continuously.
Melt the chopped chocolate with the butter in the microwave in short bursts, stirring until smooth.
Incorporate the chocolate-butter mixture into the egg batter and stir until fully combined.
Pour into the prepared dish and microwave on high power for 10 minutes.
Let cool, then refrigerate for 2 hours to set. Serve chilled for the perfect gooey texture.