I found this recipe on allrecipes a while back and we really like it...SO MUCH better than those box mixes we used to buy!! ;)
You will need:
1/2 c. butter
2/3 c. white sugar
1 c. buttermilk
1/2 t. baking soda
1 c. cornmeal
1 c. flour
1/2 t. salt
Preheat oven to 375 degrees. Spray an 8x8 baking dish.
Melt butter in medium sized bowl. Stir in sugar. Quickly add eggs and beat until well blended. Combine buttermilk and baking soda and stir into mixture. Stir in the cornmeal, flour and salt. Pour into baking dish.
Bake 30-40 minutes or until toothpick comes out clean.
Tip: I don't typically have buttermilk on hand so I usually make my own! You can do this by putting 1 tablespoon of lemon juice (or white vinegar) in a measuring cup and then filling it to the 1 cup line with regular milk. Let it stand for about 5 minutes and you're all set!