1 In a mixing bowl stir together flour, sugar, salt and yeast. Mix together butter, egg and milk in a jug then pour into the bowl and mix together to form a dough. On a floured surface knead the dough for 5-10 minutes then roll out to a rectangle 25 x 35cm (10 x 14in).
2 Spread Nutella onto dough leaving one long edge clear. Sprinkle with half the nuts and chocolate chips. Roll up towards clear edge and press well to join.
3 Slice dough into 12 and place in a buttered 18 x 28cm (7 x 11in) traybake tin in three rows of four. Cover loosely with oiled cling film and leave in a warm place until doubled in size.
4 Preheat oven to 200°C/180°fan/Gas 6. Bake for 20-30 minutes until firm. Transfer to a rack, scatter with chocolate chips, nuts and icing sugar.