I preheat oven to 460 and reduce to 450 when I put in the popovers as the oven loses heat when you open the door. If you don’t have a popover pan, you can use a regular muffin tin and just fill every other cup. This recipe works better if your milk and eggs are at room temperature. You can prick them with a knife or fork when you take them out of the oven to let the steam escape. This makes for a drier popover. You can also freeze these for up to 3 months and reheat in oven.