Cook down 20 lbs of Mushrooms

I have a team to bake 200 Neapolitan pizzas for a non-profit event using Roccbox and Ooni ovens.  At home we usually lightly fry the mushrooms before topping the pizza to ensure they’re cooked in the Roccbox.  

We’ll be buying sliced white mushrooms.  Last year we baked 135 pizzas and used the microwave to cook the mushroom.  Maybe oven roasting covered with aluminum foil? Any better ideas? 
Thanks