Sweet strudels tend to steal the spotlight, but it's time to take this flaky pastry to the savory side. We've used a store-bought phyllo dough for the easiest prep – look for it in the freezer section of your supermarket. To keep the pastry sheets from drying out and make them easier to handle, cover them with a damp towel when not in use.
Russet potatoes have a dry, starchy flesh that becomes wonderfully fluffy when baked, making them the ideal candidate for these richly spiced twice-baked potatoes. Serrano chiles can be quite hot, so reduce the amount used (or substitute with milder jalapeño) if you prefer this dish to be milder.