Place the dough in a lightly greased bowl, cover it with a damp cloth, and let it rise in a warm place for about an hour or until doubled in size.
Shape the Donuts:
Punch down the dough to release the air. Divide it into equal pieces (about 12-15 depending on the size you prefer).
Roll each piece into a long rope, then twist each rope into a spiral or braid.
Fry the Donuts:
Heat oil in a deep pot to 350°F (175°C).
Fry the twisted dough in batches until golden brown, about 2-3 minutes per side. Remove and drain on paper towels.
Coat in Cinnamon Sugar:
While the donuts are still warm, roll them in a mixture of cinnamon and sugar until well-coated.