In a bowl, sprinkle yeast on top of warm water and let sit for 3-4 minutes.
Add the egg, milk, and sugar, whisking till blended.
In a food processor, place the flour and salt.
Process to combine.
Add butter and pulse several times.
While the mixer is running, pour in the yeast mix and process till a ball of dough forms.
Wrap dough in plastic wrap and chill in fridge at least 4 hours.
On floured parchment paper, roll into a 12 inch pizza circle.
Whisk the egg wash ingredients and brush on crust. Let it rest 20 mins on counter.
Preheat oven to 400F with a baking stone on the rack.
Bake approx 15 minutes and remove.
Spread on Nutella.
Sprinkle on chips and marshmallows and return to the oven for about 5 mins.
Slice and serve immediately.
