Dissolve 25 g yeast in 275 ml lukewarm milk in a large bowl.
Add 50 g sugar, 10 g salt, 50 g butter and most of the 500 g wheat flour, and knead well together. Add more flour if the dough is too sticky.
Fold the 100 g raisins into the dough and knead until evenly distributed.
Let the dough rise, covered, for 1 hour, until it has doubled in size.
Shape the dough into 8 buns and place them in the air fryer basket with a little space between them, as they will rise further.Let the buns prove for 20 min under a tea towel.
Brush the buns with beaten 1 pcs egg.
Bake the buns at 180 °C for approx. 10-12 minutes, or until golden and cooked through. Bake in 2 batches if they don't all fit.Start the online kitchen timer here