Warm the milk until luke warm. Then add to a standing mixer with the sugar, yeast, egg + melted butter and whisk together, until creamy.
Add the flour and salt. Mix with a spoon until a rough dough and then add your dough hook and mix on a low-medium speed for 8-10 minutes, until a smooth, only slightly sticky dough forms.
Add to an lightly oiled bowl and cover with cling film. Let it rise in a warm area for 40 minutes, or until doubled in size.
Mix the filling sugar + cinnamon in a bowl.
Flour your surface generously. Put the dough onto the surface then scatter some more flour on top. Use a rolling pin to roll the dough out into a large rectangular shape which is around 2 cm thick.
Microwave your 250g biscoff spread for around 10-20 seconds, so that it is soft enough to spread easily but not fully melted.
Spread on top of the dough and then add your cinnamon sugar mix on top.
Roll the dough up into a log. Cut into equal 1 inch shapes using floss! I discarded the edges and had 9. Place into a greased baking tray and cover with cling film for 30 minutes.
Pre-heat your oven to 180°C/ 356°F.
Cover the tray with tin foil and bake for 25 minutes. Remove and then allow them to cool for 5-10 mins.
Combine the icing sugar, cream cheese, 2 tablespoon biscoff spread and vanilla paste in a bowl with a whisk. Spread the frosting on top of the slightly cooled rolls.
Finish with the rest of the biscoff spread on top and then enjoy! If you eat in the days after, microwave for 30 secs to warm up - it freshens the roll up again to make it taste similar to freshly baked!