In a large bowl, crumble the yeast into the milk and leave for a few minutes, until bubbly. Add the 2 egg yolks and the rest of the ingredients, along with a pinch of salt.
Mix to a soft dough, adding a little more flour or tepid milk as necessary. Knead on a lightly floured work surface until smooth and springy, about 5 minutes. Return to the bowl, cover with plastic wrap and then a cl