Pour into a 9 x 13-inch, lightly greased casserole dish.
Place in oven and bake for 40 - 50 minutes or until set.
To prepare the gravy:
In a saucepan, over medium heat, melt butter.
Whisk in flour and cook for 2 minutes.
Gradually whisk in chicken stock.
Reduce heat to low and cook and stir until thick enough to coat the back of a spoon, 4 - 6 minutes.
Stir in heavy cream, and season with salt, pepper, and cayenne pepper.
Serve the casserole with gravy over the top and a big side of mashed potatoes.
Notes
Aunt Lizzie's Buttermilk Cornbread recipe can be found at completecomfortfoods.com: https://completecomfortfoods.com/aunt-lizzies-buttermilk-cornbread/