Mini Mushroom Quiches

This recipe came from Vegangela: here .  I made them in regular sized cupcake pans with the puff pastry. These were seriously delish! Made about 22 of this size. Later I saw a comment that they could be made crustless, but didn't think that would work as well for minis. Next time I'm thinking of using a hash brown crust and then fill with the mushroom mixture. I know I saw a recipe in Cook's Illustrated for a potato crust. Does anyone have a recipe like that?