Wash the herbs, cut into longer stalks, the rest into small rolls. Mix cheese, milk and rolls, season
Divide the dough into triangles. Cover each triangle with 1 slice of ham and spread with cheese. Roll up from the broad side, placing the chives under the top of the dough
Place the croissants on a baking tray lined with baking paper. Brush with whisked egg yolk. Bake in the preheated oven (electric cooker: 200 °C/ convection oven: 175 °C / gas: level 3) for 12-15 minutes