Cold, firm shreds gradually soften.
Individual pieces fuse together.
The cheese becomes glossy, elastic, and deliciously stretchy.
As heating continues, bubbles may form beneath or within this molten layer.
The importance of cheese proteins
Much of cheese's texture comes from proteins called caseins.
These proteins form a network that helps hold water and fat within the cheese.
During heating, that network changes.
Depending on the cheese's composition and manufacturing process, the softened structure may become more or less flexible.
A flexible cheese surface can stretch as trapped gases push against it.
If it stretches sufficiently, a bubble becomes visible.
Some bubbles collapse quickly.
Others remain inflated long enough to develop golden or brown surfaces.
This explains why the same oven can produce different results with different cheese varieties.
The cheese itself helps determine how bubbles develop.
Why melted cheese doesn't behave like melted butter
Butter primarily contains fat and water, whereas cheese contains a substantial protein structure.
