Preheat oven to 450°F (232°C).

In a large bowl, sift together flour, salt, baking powder, and sugar.

Stir in cornmeal until well combined.

In a separate bowl, combine the beaten egg, milk, and cooking oil.

Pour the wet ingredients into the dry ingredients.

Mix until just combined; do not overmix.

Grease an 8 or 9 inch square baking pan.

Pour the batter into the prepared pan.

Bake for 25 to 30 minutes, or until a toothpick inserted into the center comes out clean.

Let cool in the pan for 5 minutes before cutting into 2-inch squares.

Serve warm.