Preheat the oven to 350 degrees Fahrenheit. Spray a 9 x 13-inch casserole dish with nonstick cooking spray and set aside.
In a large bowl, add 1 (10.5-ounce) can cream of chicken soup, 1 (8-ounce) package softened cream cheese, and 8 ounces sour cream, and mix until smooth.
Stir in 3 cups chicken broth, 1 (1-ounce) package ranch seasoning, 16 ounces uncooked orzo, 3 cups cooked chicken, chopped or shredded, 1 cup cooked and diced bacon, and 1.5 cups shredded cheddar cheese.
Pour into the baking dish and top with the remaining 1.5 cups shredded cheddar cheese.
Cover with foil and bake for 45 minutes. Remove the foil and bake for 10-15 minutes, until the cheese is melted and the casserole is bubbly. Top with green onions and serve.
Notes
Storage & Make Ahead Instructions
Fridge: Store in an airtight container in the fridge for up to 5 days. Reheat in the microwave until heated through.
Freezer: Wrap the baked and cooled casserole in plastic wrap and foil. Store in the freezer for up to 3 months. Thaw in the fridge overnight. Reheat in the oven at 350ºF until heated through.
Make Ahead: Mix all the ingredients except for the orzo and store in the refrigerator. When ready to bake the casserole, add the orzo to the filling and pour it into a baking dish. Top with cheese and bake as directed.