I have wanted to try making an enriched dough for a while so this was a perfect excuse. Mix together the flour, caster sugar and yeast in a bowl or mixer. Make a well in the centre and add the warm milk, egg and butter. Turn the mixer on or start to mix with your hands. Once mixed, knead the dough until it is nice and stretchy. Cover and leave in a warm place for 45-60 minutes or until doubled in size.
Remove the dough from the bowl and knock some of the air out. Divide the dough into two pieces and roll each piece out into a long rectangle. As you can see from the above picture an actual rectangle was hard for me to achieve but a bit of a jaunty angle here and there never harmed anyone. Spread a few spoons of the dulche de leche along the bottom two thirds of the long edge of the dough. Take half the banana and squeeze this onto the caramel towards the bottom edge of the dough. Top with half the chocolate chips.