Preheat the oven to 220°C (430°F) or 200°C (390°F) for fan-assisted ovens.
Grease a 22 x 13 cm (9 x 5-inch) loaf pan and line it with parchment paper, leaving extra overhang for easy lifting.
Combine the flour, baking powder, salt, and sugar in a mixing bowl, stirring well.
Make a well in the center of the dry ingredients and pour in the oil and milk.
Mix thoroughly until the flour is fully incorporated; the batter will be thick but easy to stir.
Transfer the batter into the prepared loaf pan, using a spatula to smooth the surface and scrape the bowl clean.
Bake the bread for 30 minutes, then remove it from the oven and cover the top with foil.
Lower the oven temperature to 200°C (390°F) or 180°C (360°F) for fan ovens, and return the bread to bake for another 20 minutes.
Take the loaf out of the oven and let it cool in the pan for 5 minutes.
Use the parchment overhang to lift the bread from the pan and place it on a cooling rack.
Allow the bread to cool completely for at least 45 minutes before slicing.