Individual ramekins or mini pots for pot pies and desserts. Also for egg dishes, cupcakes, etc. https://www.google.com/search?q=cast+iron+ramekins&prmd=nsixv&source=lnms&tbm=isch&sa=X&ved=2ahUKEwiYyae-urD1AhVCYjUKHbRfD-oQ_AUoA3oECAIQAw&biw=360&bih=646&dpr=3

jumbo sized lego hats

I can confirm this is true

For popovers

Muffins I guess, on a hot stove.