A google search of this group shows a Spanish language recipe for
coyotas, which are a sort of 2-layer Mexican cookie made with flour,
baking powder, a lot of butter and crushed piloncillo is mixed with
the flour and more of the crushed piloncillo is between the two
layers, which are then pinched together in a greased mold and baked in
the oven.
Is there really a big difference between molded piloncillo and brown
sugar?
It just seems like brown sugar would be easier to use.