Spray a 9-inch round cake pan with nonstick cooking spray.
In a large bowl, mix together flour, cornmeal, sugar, salt and baking powder.
Stir in egg, milk and vegetable oil until well combined.
Pour batter into prepared pan and bake for 20-25 minutes, or until an inserted toothpick comes out clean.
Notes
Make sure to combine the dry ingredients separately from the wet ingredients. By doing this you make sure the sugar, flour, salt, cornmeal, and baking powder are going to be evenly distributed through the whole loaf of cornbread.