In a large mixing bowl, combine plain flour, white sugar, table salt, ground black pepper, and leavening powder. Whisk together until fully incorporated.

Fold in the finely chopped sweet onions into the dry mixture. Gradually pour in the whole milk while stirring to create a chunky, sticky batter.

In a heavy pan, pour enough oil to achieve a depth of about 2 inches. Heat the oil over medium-high heat until it reaches 375°F (190°C). Test with a small spoonful of batter.

Carefully drop spoonfuls of the batter into the hot oil, leaving space between each fritter. Fry for 2-3 minutes on each side until golden brown.

Remove fritters from the oil and place on a plate lined with paper towels to drain excess oil.

Serve your fritters hot, offering a variety of dipping sauces.