Preheat the oven to 190C degrees, brush melted butter all over the inside of the molds, place molds on a baking sheet lined with baking paper.
In a small pan melt butter and add chocolate, stir till chocolate is melt.
In a medium bowl combine sugar and flour, add eggs and whisk together till combined to a smooth batter.
Pour chocolate mixture into the batter and whisk together till combined to a smooth chocolate batter.
Transfer the batter into a piping bag or a plastic bag, with one of the edges snipped off. Fill the molds to the top.
Bake for 8-10 minutes until the tops have formed a crust and they are starting to come away from the sides of their molds.
Remove from the oven, then leave to sit for 10 minutes.
Remove Chocolate fondant from the molds and serve.
