Activate the yeast by placing the milk, yeast, and sugar in the mixing bowl of a food processor. Mix together and let stand for a few minutes until it starts to foam.

Then, add the flour, egg, egg yolk, butter, and salt. Knead into a nice dough using the food processor.

Remove the dough from the bowl, then grease the bowl lightly with a neutral oil.

Put the dough back in the bowl and turn it so that it is covered with oil on all sides. Cover the bowl with plastic wrap and a tea towel, then let it rise for one hour or until the dough doubles in size.

Meanwhile, make the filling. Melt the butter in a saucepan and add the apples.

To finish the rolls, make the crumble topping by mixing all the ingredients together to form a crumble mixture.

Roll out the dough into a rectangle measuring approximately 40 x 20 cm / 16 x 8 inch.

Spread the apple filling over the dough. Roll it up horizontally and cut it into slices, each approximately 3-5 cm wide.

Place the rolls in a greased baking dish and let rise, covered, for another half hour.

Meanwhile, preheat the oven to 175 degrees Celsius / 347 Fahrenheit (top and bottom heat).

Spread the crumble topping evenly over the rolls.

Remove from the oven, allow to cool slightly and in the meantime make the frosting by mixing all the ingredients together to form a thick paste. Spread this over the apple rolls. And enjoy!