I feel like the other side of that central plate has your answer. Pop the central screw and see what is on the other side of that discoloration.
this post was submitted on 15 Sep 2024
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Looks the same on the other side, the pattern on the unburnt metal looks like galvanized steel, did the zinc burn off?
That looks like it, maybe use vinegar to dissolve the zinc?
That just looks like discoloration that sheet metal gets with repeated heating. I would investigate the controls, there are contacts that open/close as a bimetallic strip heats up and cools off (basic thermostat). if the contact are arcing or stuck it could over heat, also since you said smoke was coming from the knob. . .