Go make these now! Don't bother with the bat shape, just make them and devour. Don't know how to make dulce de leche? Get a can of sweetened condensed milk (take label off), boil it in the can in a big pot of water for three hours (keep it covered with boiling water), yes, three hours... your house will get nice and steamy and your neighbors may wonder what is going on in there??!!...your pores will open up beautifully too... but then you will have...the nectar of the gods (common sense caution: don't open the can until completely cool, okay?). These cookies really just serve as a vehicle to keep yourself from eating the stuff right out of the can. Happy Halloween!