Preheat oven to 400 degrees Fahrenheit. Spread cubed cornbread on a baking sheet and toast for 10 minutes until golden brown. Reduce oven heat to 325 degrees Fahrenheit.
In a large skillet, cook sausage over medium heat, breaking it up as it browns. Add celery and onions and cook for five to eight minutes until softened.
Drain excess fat and transfer the sausage mixture to a large bowl. Add toasted cornbread, parsley, sage, oregano, salt, and pepper. Mix gently.
Pour chicken broth over the mixture, then stir in the beaten egg and shredded cheese. Mix lightly until just combined.
Spoon into a greased two-quart casserole dish. Cover with foil and bake for 35 minutes at 325 degrees Fahrenheit. Remove foil and bake for 10 minutes until golden.
Serve warm and enjoy.