Combine all the dough ingredients in a stand mixer bowl and knead for 10 minutes. Cover the bowl and let the dough rise until it doubles in size, between 1-2 hours.
Press the dough with your hands to let the air out and divide it into 6 parts (for 3 cakes). Roll out each part into a rectangle, then spread the Nutella and Biscoff cookie butter. Roll and freeze for 30 minutes.
Take out the dough rolls and cut each one in half lengthwise. Braid them as you’d braid a challah (as shown in the video) and let them rise for 30-60 minutes.
Preheat the oven to 340 °F (170 °C) and bake for 30-35 minutes, or until golden.
Syrup:
Bring the water and sugar to a boil in a small pot, lower the heat and cook for 5 minutes, stirring occasionally.
When the cakes come out of the oven, drizzle the syrup on top and let them cool off for 20 minutes before serving.