See my gluten-free all-purpose flour mix here
. It's simple, economical, and works well!
Some people recommend piercing popovers when they reduce the oven temperature at the half-way point (or at the very end and leaving in another minute or two), to make them drier. That’s up to you, but dry is typically NOT something we are looking for in gluten-free recipes. I love that these are super moist; that factor is especially great for reheating. Of course, if you are a reader who eats gluten with no issues, all-purpose flour can be used and the xanthan gum omitted.