Combine first 5 ingredients in a bowl, mix well.
Whisk in vegetable oil and mix until dry mixture is smooth and lumps are gone.
If another recipe is calling for a box of Jiffy Corn Muffin Mix, add the above mixed ingredients to that recipe.
To make Corn Muffins, preheat oven to 400F, spray muffin pan with non-stick cooking spray.
OPTIONAL: To mix, add any combination of optional ingredients you prefer.
Combine mix with egg and milk, mixing well.
Fill muffin pan ½ full, bake for 15-20 minutes.
