Bring a large saucepan to medium-high heat. Add 1 tablespoon of olive oil. Add the ground sausage to the pan and sear untouched for 3 minutes. Break apart the sausage and continue cooking until browned. Use a slotted spoon to remove the sausage from the pan and set aside in a large bowl.
Lower the heat to medium. Add 3 tablespoon of butter to the pan. Add the chopped celery and onion. Saute for about 8 minutes, stirring occasionally. Season with salt, pepper, and poultry seasoning. Add the garlic and saute for another minute. Transfer the mixture to the bowl with the sausage.
Add the mushrooms to the pan. Allow them to saute for 5 minutes or until they turn a deep brown color. Stir occasionally and then remove and add them to the bowl.
Add the rice to the saucepan. Toast for about 2 minutes stirring often. Add the white wine and stir until it is completely absorbed. Add the chicken broth and bring to a boil. Lower to a low simmer and cover. Simmer for 15 minutes.
Preheat the oven to 375℉. When the rice is finished, add it to the bowl with the sausage, celery, onions, and mushrooms. Combine everything and mix in the parmesan cheese.
Oil the baking dish. Add the stuffing to the dish and bake it in the oven for 30 minutes. Remove and serve.
Notes
Leave the sausage to sear untouched for at least 3 minutes to develop a crust. This texture and sear will develop the flavor throughout the whole dish. You don't have to cook the sausage all the way through because we are going to bake it. Just cook until it is brown.
Don't add more oil to saute the mushrooms. They are filled with water and will saute to the best texture if sauteed in an almost dry pan.
It is not recommended to stuff the turkey with stuffing but to each their own.