Put the first 3 ingredients into a ramekin/any small oven proof dish thing. Put onto a baking tray and then into an oven which is preheating to 350°F (180°C), for 1 minute (just so the coconut oil melts).
1 1/2 tsp coconut oil or neutral oil, 1 tbsp brown sugar or coconut sugar, 1 tbsp maple syrup, golden syrup or agave syrup
Add the vanilla, salt, baking powder, and flour - stir in (easier if your ramekin/dish has high edges. If it's too hard to mix, just pour the contents into a small bowl, mix and smooth into the ramekin/dish).
1/4 tsp vanilla extract, 1/8 tsp flaky salt, 1/8 tsp baking powder or bicarbonate of soda, 2 tbsp + 2 tsp whole wheat flour
Smooth the dough in the dish and scatter over the chocolate chips, pressing them in slightly. Sprinkle on some fleur de sel and bake for 7-10 minutes, until golden brown but still squidgy in the centre. Eat while still warm.
1 to 2 tbsp chocolate chips or chopped chocolate