Preheat the oven to 180°C (356°F).
In a large bowl, mix together the flour, baking powder, salt, and sugar.
Add the eggs, milk, and cooking oil (or butter), and mix well.
Pour the well-mixed batter into a baking pan.
Bake in the oven at 180°C for 30 to 40 minutes.
Let it cool, then cut into desired sizes.