Put the first 8 ingredients in your bread maker on a short dough cycle, around 45 minutes usually

If doughing by hand, mix the yeast with the warm water and sugar and leave to react for a few minutes, then mix in the mashed potato, melted butter and salt before gradually adding the flour and choc chips

Knead for 10 minutes then place in an oiled bowl to rise for an hour covered with a cloth before deflating the dough

Split the dough into 8 balls. Brioche looks like a ball with a little ball balancing on top. My kids say they look like ladies bazooms lol, so instead I shape mine like cinnamon rolls!

Place your shapes side by side on a greased pan. For the 'crown' effect place them around in a circle, one in the middle, then a row around that. You will need 6 for that with 2 left over

Cover loosly with tin foil and sit in a warm place until doubled in size

Preheat the oven to gas 5 / 190C / 375°F

Brush the tops of the brioche with the oil/milk mix then cover back up loosly with the foil so they don't brown too much in the oven, and bake for 20 minutes

Reduce the oven to gas 4 / 180C / 350°F and bake, still covered for another 15 - 20 minutes. The buns should sound hollow when tapped if they're ready

Brush with the 2 tsp melted butter as soon as they come out of the oven. Remove from the tray after 5 mins and set on a wire rack to cool