In a large mixing bowl, combine warm milk, melted butter, and sugar. Stir until the sugar is dissolved.

If using dried yeast, sprinkle it into the warm mixture and let it sit for 5-10 minutes until frothy.

Add flour and salt to the mixture, followed by sourdough starter. Mix until a rough dough forms, then knead for 5-10 minutes.

Place dough in a greased bowl, cover, and let rise for 1-2 hours if using commercial yeast, or 4-8 hours for active starter.

After rising, deflate the dough, divide into 8-10 pieces, shape into balls, and rest for 10-15 minutes.

Heat vegetable oil to 170°C (340°F) in a large pot or deep fryer.

Roll out each dough ball to 1/4-inch thickness, fry 1-2 pieces at a time for 2-3 minutes on each side.

Remove from oil and coat immediately with cinnamon sugar while warm.