Place a rack in the center of the oven and preheat to 450°F.

Grease a six-hole popover pan.

Place the milk in a medium-sized container that has a pourable spout.

Add the egg to the milk and whisk.

Add the salt, and whisk it around again.

Now add in the half-cup flour and the pinch of baking powder and whisk until you have a smooth batter.

Preheat the greased pan for 5 minutes.

Remove the pan and put a bit of butter in each of the greased compartments.

Fill each popover compartment about half full.

Place the popovers in the center of the oven and bake at 450°F for 15 minutes.

Lower the temperature to 350°F and bake another 15 minutes.