In a skillet, brown ground beef and drain off any excess grease.
Mix in tomato sauce, undrained kidney beans, and chili seasoning. Bring to a boil, reduce to a simmer and cover. Allow to simmer for about 10 minutes, stirring occasionally.
Meanwhile, in a mixing bowl, add melted butter and sugar and mix together. Add in the egg and stir to combine.
Add in the buttermilk, baking soda, flour, cornmeal, and salt. Mix with a fork, just until combined.
Spoon 1 cup of chili into four 9oz. ramekins. Spread 1/2 cup of the cornbread batter evenly over each ramekin, and place on a baking sheet.
Bake at 375 degrees until cornbread in cooked all the way through, about 20-25 minutes. Sprinkle the corn bread with some shredded cheese. Place back in the oven for a minute or so, just to melt the cheese. Serve with sour cream. Makes 4-5 servings.