Popovers: high baking from a simple liquid mixture

Useful to know

Popovers are tall, light bakes with a crisp exterior and soft, egg-rich interior. King Arthur’s recipe uses flour, milk, eggs, salt and butter and allows a standard metal muffin tin. [1]

Using that tin does not make them ordinary muffins. The source emphasizes preheating and leaving space for expansion. Check clearance below the upper heating element, since the risen popovers may approach it. The size of each cavity also affects how the batter should be divided.