Cars in the oven

Boy likes to take cookie sheets, muffin tins, things like that and pretend that he is baking. He will fill all of the muffin tins with paper muffin cups. Then he will fill all of those cups with things like matchbox cars. We pretend to eat them. It's lots of fun. They are tasty. It's all good pretending. The problems arise when it comes to attention span. He puts these trays of cars in the oven then moves on to playing baseball, going to the potty, painting. Really, anything different.

Who checks to see if anything is inside the oven when they turn it on to preheat it to make Tater Tots? Well, not me. The cars get really hot and the wheels develop a flat spot where they melt. So I need to leave them to cool down, much like one would leave actual muffins to cool down. Some of the nicer cars are made of part metal and part plastic. Those are the best. The pipe truck has 3 plastic pipes on the top of a flatbed truck. They are all curled up. God forbid I throw any of the ruined cars away, though. He has four thousand of these things and knows all of them. We have bins of tiny matchbox cars, many with melted parts and wheels with a flat spot.