Step #2 Generously butter a popover pan or 2 mini-muffin pans.
Step #3 In a medium bowl, whisk the milk with the flour & salt; there will be some lumps.
Step #4 Add the eggs & butter & whisk just until mixed.
Step #5 Heat the prepared pan or pans in the oven until the butter is sizzling, about 1 min.
Step #6 Carefully spoon the popover batter into the pan or pans: Fill the popover pan two-thirds full for giant popovers or fill the mini-muffin pans three-quarters full for mini popovers.
Step #7 Bake the popovers for 15 mins without opening the oven, then lower the temperature to 350° & bake the minis 15 mins longer, or the giants 20 mins longer.
Step #8 Transfer the popovers to a baking sheet, poke a small hole in the tops with a tooth-pick & then dry them out in the oven for another 10 mins.