Place the plain flour, salt, baking powder and sugar in a bowl. Mix together and make a well in the centre.
Pour the milk and egg into the well and whisk the mix until smooth. Split into two bowls.
To one bowl add the additional 2tbsp plain flour. In the other add the cocoa. Whisk both together.
Heat a frying pan and melt the butter until foaming. Place a large cookie cutter in the centre then pour a small amount of pancake mixture into it. Cook until bubbles appear on the surface then remove the ring and turn over.
Repeat with the mixture.
To assemble the stack, pile up the chocolate and plain pancakes sandwiched between Nutella and Marshmallow Fluff.