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Preheat oven to 350°F (175°C). Spray a 2-quart casserole dish with nonstick cooking spray and set aside.
Brown the sausage - add pork sausage to a medium skillet over medium-high heat and cook for 3-4 minutes, until most of the pink is gone.
Add vegetables - stir in diced onion, diced celery, and minced garlic. Cook for 4-5 minutes longer, until the vegetables are tender and the sausage is no longer pink.
Combine ingredients - in a large bowl, mix the cooked sausage mixture, chicken broth, cream of celery soup, and uncooked rice until well combined.
Assemble casserole - pour mixture into the prepared casserole dish and top with slivered almonds. Cover the dish tightly with aluminum foil.
Bake - place in preheated oven and bake for 60 minutes.
Rest and serve - remove the casserole from the oven and let it rest for 10 minutes before serving.