The recipe is from Eric Kayser which I have seen on various French bread blogs:
500 g Bread flour
20 g milk powder
75 g 100% hydration starter refreshed
5 g dry instant bakers’yeast
250 ml tepid water
75g soft butter
Generous handful of cholocate chips
1 egg yolk to glaze
In a large mixing bowl, dissolve the yeast in the water. Add the starter and mix well.
Add the flour, milk powder, sugar and salt. Knead for 10 minutes.
Add the butter , a little at a time and knead further.
Leave to rest for 15 minutes.
Add cholocate chips to dough, then divide in 4 balls.
Leave to rest for another 15 minutes.
Shape in long baguettes and keep in a baker’s couche or a well floured tea-towel.
With a lame, slash the pain several times.
Leave to proof for 1h30 – 2 hours until doubled in size.
Brush with the egg yolk.
Bake in a hot oven at 220C for 15-20 minutes.
Ideal for breakfast or for us French, as a 4 o'clock "goûter" with 3-4 chocolate pieces !