In small bowl, dissolve yeast in lukewarm milk with 1 tsp of the sugar. Let stand til bubbly. Combine flour, sugar and salt. Mix yeast mixture, melted butter and and egg yolk together lightly.
Knead until smooth. Cover and let rest until doubled in size. Roll flat. Spread some butter on the dough and sprinkle with sugar and instant cocoa powder.
Roll. Cut in to slices. Place slices on greased pan, let rest for 15 mins
Bake the snails in preheated 200 C oven for 15-20 minutes.