Preheat oven to 400°F (200°C). Grease a 9-inch round baking pan with shortening and set aside.
In a medium bowl, combine cornmeal mix, sugar, and oil together until blended.
In a separate small bowl, whisk egg and buttermilk or milk together.
Add egg and milk mixture to cornmeal mixture, stirring just until combined (batter will appear slightly lumpy).
Pour batter into a prepared baking pan, and spread evenly with a spoon.
Bake in preheated oven for about 20 minutes or until golden brown, the center should feel firm when touched.
Allow the cornbread to cool in the pan for about 10 minutes before slicing and serving.