Take the puff pastry out of the refrigerator about 10 minutes before preparing it. Then roll out and spread about 3 tablespoons of sweetened condensed milk on top.
Roll up loosely from the narrow side. Cut into 1 - 2 cm wide slices and place in a greased baking dish. Be careful, condensed milk could drip out. Then pour the remaining condensed milk over the snails.
Bake at 175 ° C top / bottom heat for about 20 minutes. If they turn lightly brown, they are done.