Actually just bought a couple of 5 packs of those school pizzas at the butcher shop last week.
They are good - big enough that if I need something for a lunch I can do one, or if I want a snack I’ll just cut it in half and toss in the toaster oven.
Oddly - our school never had these. Wife made me aware of them. School I went to was 2 blocks away from a pizza shop and the cafeteria just contracted with them to bring in several trays once a week on Wednesdays.
Ohio valley/Pittsburgh style pizza - square cut trays and the pepperoni tossed on after it had been baked. I’ve never done it with anything but extra cheese lately - the idea of uncooked toppings is stuoid to me.