In my humble opinion, adding sugar to cornbread is a sin. If you want cake, bake a cake.My recipe for cornbread, and it's very simple.
1 Cup cornmeal (yellow or white)
3 T flour
2/3 t salt
2/3 t soda
1.5 Cup buttermilk
1 egg
Preheat oven to 450 degrees. Put 2 T oil in a castiron skillet (8 or 9 inch)and heat until smoking. Meanwhile mix ingredients. When oil is smoking in the skillet, pour the hot oil into the mixed ingredients and stir. Pour mixed ingredients back into the skillet and place the skillet into the preheated oven In about 20 minutes you will have a good sillet full of cornbread.
DougR