In a large bowl, sift together the flour, sugar, baking powder, and salt.
Add the 1/4 cup of vegetable oil to the dry ingredients and mix until well combined.
Gradually add the warm water, mixing until a soft dough forms. You may need to adjust the amount of water slightly.
Knead the dough on a floured surface for about 5 minutes until smooth and elastic.
Place the dough in a lightly oiled bowl, cover with a clean cloth, and let it rise in a warm place for about 1 hour, or until doubled in size.
Punch down the risen dough and turn it out onto a floured surface.
Roll or flatten the dough to about 1/2 inch thickness.
Cut the dough into round or square pieces, depending on your preference.
Heat vegetable oil in a deep frying pan or pot over medium heat.
Carefully fry the dough pieces in batches, turning them occasionally, until golden brown and cooked through, about 3-5 minutes per side.
Remove the vetkoek with a slotted spoon and drain on paper towels.
Enjoy your meal!