Place milk and yeast into the Thermomix bowl and cook for 1 minute, 37 degrees, Speed 1.
Add flour, salt, softened butter, sugar, egg, cinnamon and nutmeg and mix for 6 seconds, Speed 7.
Select the kneading function and mix for 3 minutes.
Add the chocolate chips and selecting the kneading function, mix for 30 seconds.
Work the dough into a ball on a lightly floured board before covering with a thermomat/ placing in a bowl and cover with a tea towel.
Keep in a warm place for 30 minutes to allow the dough to prove (it should double in size).
Divide the dough into 12 portions and roll into balls.
Grease and line a baking tray and place the dough balls 1cm apart in the tray.
Preheat oven to 220 degrees celsius (fan-forced).
To make the piping, mix the flour, cocoa, sea salt, olive oil and water in the Thermomix bowl for 20 seconds, Speed 4.
Scrape down the sides and repeat for a further 20 seconds.
Place the mixture into a piping bag (or a sealable ziplock bag with the edge corner snipped off.
Pipe crosses onto the buns.
Place the tray into the oven and bake for 10-15 minutes or until golden.
Meanwhile, heat the sugar and water in the TM bowl for 2 minutes, 100 degrees, Speed 4.
Brush the syrup over top of the warm buns.
Leave to cool slightly before transferring to a wire rack to cool completely.