Cooking: What Sort of Pizza Cheese/Cooking Produces This Effect?

Inspired by an answer from @MCheetah, the old-school Chuck E. Cheese used to have this type of bubbly cheesy with slightly burnt bits at the top creating a freckly-looking effect on the pizza:
Cooking: What Sort of Pizza Cheese/Cooking Produces This Effect?
I've since become curious about how to replicate that effect. I was thinking it must be a very dry cheese or sets of cheeses if they don't just use Mozzarella, and maybe even medium-low in fat. Or maybe they drizzle oil on top to prevent all but little parts from getting burnt?

I kind of have a nostalgic fondness for that type of pizza.
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One thing I know from trying to look up Chuck E. Cheese is that until recent years, they didn't use freshly-grated cheese. They used pre-shredded.
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Tried a small experiment the other day using very dry cheese but instead of little pleasant burnt bits like in the above pic when I let it sit in the oven until parts were getting burnt, it made huge ugly burnt spots that just tasted awful. I don't understand how to keep it all small and nice like that. Also, wonder if they use a lot of sauce? Maybe the sauce is bubbling up under the cheese... or maybe it also has to do with the oven and how much heat is coming from the top. I have no idea!
Cooking: What Sort of Pizza Cheese/Cooking Produces This Effect?
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