In a large mixing bowl, place the flour, cornmeal, sugar, baking powder, and salt.
Using a wire whisk, mix these ingredients well until they're evenly distributed.
In the same bowl, add the vegetable oil.
Continue to whisk the mixture until it's smooth and there are no more lumps.
For the Corn Muffins
Preheat your oven to 400F (200C) for the Corn Muffins.
Prepare your muffin pan by spraying it with non-stick cooking spray.
In the bowl with your dry mixture, now add an egg and milk.
Mix these ingredients well with your whisk until everything is nicely combined.
With a spoon, carefully fill each muffin pan cup half full with your mixture.
Place the pan in the preheated oven and bake your muffins for 15 to 20 minutes. Check if they're done by inserting a toothpick in the center of a muffin. If it comes out clean, your muffins are ready! If not, give them a few more minutes.