Published January 9, 2007. From Cook's Illustrated.
We only found one brand commonly available, but it works well.
Only tangentially related to muffin tins, popover pans are composed of heavyweight steel cups affixed to one another with thick steel wire. The open design maximizes heat transfer, which is crucial to high-rising popovers and babas au rhum. Very few companies manufacture popover pans these days; in fact, most cookware stores carry only one—the Chicago Metallic 6-cup Popover Pan. We found these pans, glazed with a dark nonstick coating, brown popovers (or babas) well and release them easily. Popover pans typically have six cups.