In a small bowl, combine warm milk and yeast; let sit for 5 minutes until frothy.

In a large bowl, whisk together flour, sugar, cocoa powder, and salt.

Add melted butter and eggs to the yeast mixture; combine with dry ingredients until a dough forms.

Knead the dough on a floured surface for about 5 minutes until smooth.

Place in a greased bowl, cover, and let rise in a warm place until doubled (about 1 hour).

Roll out the dough into a rectangle, spread softened butter, and sprinkle cinnamon-sugar filling evenly.

Roll tightly and slice into equal pieces; place cut-side-up in a greased baking dish.

Let rise again for about 30 minutes before baking at 350°F for 20-25 minutes or until golden brown.