Preheat oven to 400 degrees F. Grease a 9x13 inch casserole dish and set aside.
In a bowl combine the Jiffy mix, sour cream, creamed corn, and eggs. Stir together until well mixed.
Spread the mixture into the bottom of the 9x13 inch casserole dish.
Place in the oven and bake for 30-35 minutes.
While the cornbread crust bakes heat a large skillet over medium high heat. Add the ground beef and onion and cook until the ground beef is cooked through then remove from the heat and drain off any excess grease.
Place the ground beef back in the skillet and add the enchilada sauce, stirring it together with the beef.
Once the cornbread finishes baking remove it from the oven and spread the ground beef mixture over it.
Top the beef with the cheddar cheese and place it back in the oven to bake for 10 minutes or until cheese is fully melted.
Remove from oven and let cool for 10 minutes before serving with your favorite toppings.