Knead the first 7 ingredients together well and knead in the chocolate chips last. Preheat the oven to 175 degrees (convection 160 degrees) and line a baking sheet with baking paper. Shape the dough into balls of the same size and place them on the baking sheet with a little space between them. Mix the egg with a little milk and brush the balls with it. Put the chocolate rolls in the preheated oven and bake for about 15-20 minutes