Heat oven to 400°F.

Brush the cups of a 12-cup nonstick muffin tin with butter.

In a bowl, whisk together the flour, milk, eggs, butter

and salt until only a few lumps remain (do not overmix).

Divide the batter among the prepared muffin cups

and bake until puffed and a deep golden brown, 30 to 35 min.

(Do not open oven door before 30 min or

the popovers will collapse. Remove 1 popover to check that

the underside is browned.) Serve immediately.