Grease a 13x9 inch baking pan with a good layer of butter (this gives the cornbread a crispy crust)
Mix the dry ingredients in a large bowl and form a well in the middle of the mixture.
Mix egg, milk, melted butter, and oil in a large mixing bowl. Pour into the well of dry ingredients; mix well.
Pour mixture into prepared pan, spread into an even layer, and bake 20 to 25 minutes or golden brown and cake tester inserted in center comes out clean.
Cool 5 to 10 minutes before slicing. Serve with butter, honey, or jam.