Preheat oven to 400 degrees F. Grease 6 ramekins with butter and line the bottom of each with a circle of parchment paper. Place the ramekins on a baking sheet.
In a double boiler or microwave in 20 second increments, melt the chocolate chips and butter until smooth. Set aside and allow to cool for 15 minutes.
In a large bowl, beat together the eggs and sugar until pale. Mix in the flour until smooth. Slowly fold in the cooled chocolate until combined.
Pour the mixture into the prepared ramekins, 3/4 full. Bake in preheated oven just until the tops are barely set but still wobbly in center, about 13 minutes. Allow to cool for 5 minutes before inverting onto serving plates.
Serve immediately with powdered sugar, whipped cream or vanilla ice cream, fresh berries, and mint leaves.