Step 1

Adjust oven rack to middle position and heat oven to 400 degrees. Lightly spray cups of popover pan with vegetable oil spray. Using paper towel, wipe out cups, leaving thin film of oil on bottom and sides.

Step 2

Whisk together flour and salt in 8-cup liquid measuring cup or medium bowl. Add milk and eggs and whisk until mostly smooth (some small lumps are OK). Distribute batter evenly among prepared cups in popover pan. Bake until popovers are lofty and deep golden brown all over, 40 to 45 minutes. Serve hot, passing butter separately. (Leftover popovers can be stored in zipper-lock bag at room temperature for up to 2 days; reheat directly on middle rack of 300-degree oven for 5 minutes.)