I Smelled Plastic

I walked into the kitchen just as my husband was bounding in whispering “oh s**t oh s**t!” He had preheated the oven for a nice meal of leftover baked spaghetti and forgot the high chair tray was in there.
Currently waving dish towels in the air to keep the smoke alarm from waking the toddler. Oh, and ordering in. Probably should be saving money though, since we have to get a new oven now? No idea how to even begin cleaning this…