warm the milk to 110˚
pour the milk in the bowl of a stand mixer, sprinkle two teaspoons of the sugar and the yeast over the milk
using the paddle on the stand mixer, stir to combine
let it rest 5-10 minutes until it's bubbly
then add 1/2 cup of flour, the sugar, the eggs, the yolk, the vanilla and the salt and beat to combine
slowly add the flour a 1/2 cup at a time
once the flour is incorporated turn the mixer up to about 4 and beat the dough
start adding the butter and beat until the dough is shiny, soft and it forms strands
lightly grease a bowl and turn the dough out into it
the dough will feel weird but that's ok it's a very enriched dough
cover and let rise until doubled
once it's risen sprinkle some flour on your clean counter and dust your rolling pin as well
mix up your egg wash
line loaf pans with parchment paper
grease your hands and a spatula
divide the dough in half and place half on prepared counter,
roll the dough out to an 18x10 inch rectangle with the long edge facing you
dot the dough with half the Nutella and carefully spread it over the dough leaving 1/2 inch border all the way around
brush the egg wash on that edge closest to you and
starting at the edge farthest from you gently roll up the dough and pinch it closed where you brushed the egg wash
make a loop and seal the ends together as well, then fold the loop in to a figure eight and double that figure eight
slip it in a prepared pan
repeat with the second half of the dough
cover with buttered foil and let rise until the dough comes up to the top of the bread pan
refrigerate the last of the egg wash