, Combine in a bowl the flour, the brown sugar, the chocolate chips, the cocoa powder, the baking soda, and the baking powder. Mix thoroughly with a spoon to combine the ingredients as much as possible before beginning the next step.
 Combine the vanilla, butter, egg, banana, and crème fraiche to the bowl with the dry ingredients. Stir it with a spoon, just enough to mix everything evenly.
 Put some batter into each of the muffin moulds using the spoon. Only fill them to about 2/3 of their capacity since the batter will rise while baking. Place the muffins onto a baking tray and put them into the oven. Allow to bake for about 25-30 minutes.
 Once the muffins are done, take them out of the oven and let them cool a little before removing them from the moulds. Place them on a serving tray.
 If you like, you can sprinkle the muffins with a little icing sugar. They taste best if you eat them while still warm. Enjoy!

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Preheat the oven to 320 degrees F, 160 degrees C, or on gas mark 2.;
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Mix all the dry ingredients together.
Add the wet ingredients to the dry.
Bake.
Remove from the oven.
Serve.
Finished.
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