Then add the rest of the ingredients. Let it sit for twenty minutes. Stir again and pour into greased molds. For Yorkshire pudding, you must use beef drippings for your grease, and bake in a large shallow pan. Popovers may be baked in molds of that name or muffin pans.
Most recipes say to get the fat smoking hot before pouring in the batter.
I used spray oil on muffin pans and sprayed and then filled all of them, cold. I then put them on the hearth in a 350 F oven. They baked for twenty-five minutes. In a rack oven I would increase the temperature to 425 F. I made Yorkshire puddings every second Sunday, one summer. The oven had no thermostat.