Place the flour, caster sugar, salt, cinnamon, mixed spice and butter into the Thermomix bowl and mix for 5 seconds, Speed 8. Set aside in a seperate bowl.
Add the milk to the Thermomix bowl and heat for 3 minutes, 37 degrees, Speed 1.
Add the dried yeast and mix for 5 seconds, Speed 2. Allow to sit for 10 minutes.
Add the flour mixture that you set aside and the egg to the Thermomix bowl and mix 10 seconds, Speed 7 or until combined.
Mix on Interval/Knead function for 2 minutes. Add the chocolate chips and mix on Interval/Knead function for a further minute (see notes).
Set the dough aside in a ThermoServer or bowl covered with a tea towel and place into a warm spot. Leave for 1 hour or until the dough has doubled in size.
Preheat oven to 200 degrees celsius (fan-forced).
Place the dough back into the Thermomix on Interval/Knead function for 3 minutes.
Divide the dough into 16 even sized balls. Place into a round wreath shape on a flat and baking paper lined tray. Place back into a warm spot to prove for a further 30 minutes.
To make the piping paste, place all of the piping ingredients into a clean Thermomix bowl and mix for 20 seconds, Speed 4. Scrape down the sides of the bowl and mix for a further 10 seconds.
Pipe crosses onto the hot cross buns, sprinkle over the extra chocolate chips and bake in the oven for 20 minutes or until golden brown.
To make the glaze, heat the water and sugar in the Thermomix for 2 minutes, 100 degrees, Speed 4. Brush over the still-warm hot cross buns.