^^This is right. Butter isn't like oil Even margins 48% wouldn't catch fire. IMPORTANT: If you do it and your pizza is awesome, you should defiantly give your toaster a bath, don't unplug it. If it turned on then the cheese will come off easier.
The cheese wouldn't melt again (desirable to mimic freshness) this way and the toaster opening is only so wide, so only part of your pizza would get a majority if the heat. The heat also dissipates, so you're also wasting electricity at this point.
I just wonder why OP doesn't microwave, oven heat, or stove top heat the slice. Also, I think bc of the lack of him posting he's given up on this thread and has already eaten the slice lol
I say it depends on crust density. Thin would heat the cheese quickly, but a thick deep dish would be an issue. No matter what he had to of eaten it by now. If not he is seriously stoned, or waiting on the fire department