Prepare the onions: Thinly slice the onions and place them in a bowl. Sprinkle with salt and mix, allowing them to sit for about 5 minutes.

Mix the batter: Combine all-purpose flour, baking powder, sugar, and a pinch of salt in a bowl. Whisk together, then add the egg and mix until smooth. Gently fold in the onions.

Heat the oil: Pour enough oil into a frying pan to cover the bottom by about 1/2 inch. Heat over medium-high heat.

Fry the fritters: Drop spoonfuls of batter into hot oil, flatten slightly, and fry for about 3-4 minutes on each side until golden-brown.

Drain and serve: Use a slotted spoon to remove the fritters, letting excess oil drip off. Serve warm with your favorite dips.