Mix the yeast with the milk. Let stand in a warm place for 10 minutes until the mix foams.
Add the flour, sugar, butter and salt and knead into smooth dough. Cover and let rise for 40 minutes.
Knead the dough once more and roll out on a floured surface to a rectangle of approximately 70x30 cm.
For the filling, stir together the butter, sugar, and cinnamon in a bowl until well mixed. Spread the filling evenly on the dough with a spatula or a scraper. Roll up the dough from the long side and cut into 5cm thick slices.
Line a baking sheet with parchment. Preheat the oven to 220 C / Gas 7. Place the rolls at a generous distance on the baking sheet and cover with a tea towel. Let rise 15 minutes.
Bake in preheated oven 12-15 minutes until golden brown.
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