Preheat oven to 350 degrees. Spray or brush an 8x8 inch baking dish with olive oil.
Melt the butter in a large skillet and sauté the diced onion and celery for about 5 minutes, or until they soften.
Add the cream of chicken soup, sour cream, chicken broth, and dry basil and/or oregano. Stir well.
Add the cooked rice and chicken and stir until well combined. Taste carefully (it might be hot!) and season with salt and pepper, if desired. Mix again.
Pour mixture into your prepared 8x8 baking dish. Sprinkle with parmesan cheese and dry parsley.
Bake uncovered for about 30-35 minutes, or until golden brown and bubbly. Allow to rest 5 minutes. Serve warm and enjoy!