I think this is the recipe I like the best for popovers. They are huge, light and airy. I get asked to make them every Christmas.
https://www.foodandwine.com/recipes/pats-popovers
I use the I Hate to Cook Book recipe - Peg Bracken’s classic. It’s just 4 ingredients - flour, eggs, milk & salt. The same as pancakes. I use beef drippings if I have them - so many roasts are so lean it is a problem getting that fat.