In einer großen Schüssel das Mehl, die Hefe, den Zucker und das Salz vermischen.
Add the lukewarm milk, melted butter, and egg.
Mix until a soft dough forms, then knead for 8–10 minutes until smooth and elastic.
Place the dough in a lightly greased bowl, cover, and leave to rise for about 1 hour or until doubled in size.
Punch down the dough and roll it out to about 1 cm thick.
Cut the dough into diagonal (diamond-shaped) pieces.
Heat the oil to 170–180°C.
Fry the pieces in batches for 2–3 minutes per side until golden brown.
Remove with a slotted spoon and drain on paper towels.
Mix the sugar and cinnamon together, then roll the warm skuinskoek in the mixture until evenly coated.
Serve warm or at room temperature.