Preheat the oven to 180°C.
Prepare the starter: warm the milk so it’s just lukewarm, not hot. Mix with the yeast and a tablespoon of sugar, and let it sit for 10 minutes until foamy.
In a bowl, combine the flour, sugar, and salt. Add the egg and the prepared starter. Knead for 6–8 minutes using a mixer with a hook or by hand. Finally, add the soft butter and knead for another 5 minutes until the dough is smooth and elastic.
Cover the bowl and let the dough rise in a warm spot for 1–1.5 hours until it doubles in size. Roll it out into a rectangle and spread the prepared filling evenly on top.
Using a sharp knife, cut the dough into strips and roll each one into a swirl – this is my favourite method because the rolls stay snug and retain their shape.
Place the rolls in a baking tray, leaving a little space between them. Cover and let them rise for another 30–40 minutes. Just before baking, drizzle a bit of cream over the rolls, into the gaps and on top.
Bake at 180°C (top and bottom heat, no fan)
for 20–25 minutes until lightly golden. Prepare the cream and spread it over the rolls while they’re still slightly warm.