I Ordered a Pizza in the Evening—and Noticed Something Strange
The specific type of cheese used also plays a role, as some varieties have a higher moisture content or different melting properties that make them more prone to bubbling. Furthermore, a high cooking temperature accelerates this reaction, resulting in a more pronounced, bubbly surface.
The most important takeaway from my research is that these bubbles are entirely safe to eat. Far from being a sign of spoilage or a botched order, a bubbly cheese surface is actually an indicator of a well cooked pizza. It shows that the cheese has been subjected to the proper heat necessary to achieve that classic, savory melt