Add all the ingredients for the dough to a bowl and mix for 5-7 minutes until you have a smooth, elastic dough.
Place the dough in a bowl and cover with a lid, plastic wrap, or a clean kitchen towel. Let rise for 1 hour, or until doubled in size.
Roll out the dough into a rectangle of about 12 x 16 inches (30 x 40 cm). Mix the ingredients for the filling and spread evenly over the dough.
Roll up the dough from the long side. Use a sharp knife to cut it into 12 slices. Place the pieces on a baking sheet lined with parchment paper, leaving enough space between them.
Cover the baking sheet and let the buns rest for 45 minutes.
Brush the buns with the beaten egg and sprinkle with pearl sugar.
Bake the cinnamon buns at 220°C/425°F for about 12-14 minutes, until cooked through and golden brown (conventional oven).
How to store
Keeps for about 5 days at room temperature. Can be frozen for up to 3 months.