Spray a 9x9-inch casserole dish with nonstick cooking spray.
In a large mixing bowl, combine shredded chicken, cream of chicken soup, cheddar cheese, sour cream, green onions, chicken broth, Dijon mustard, garlic powder, onion powder, black pepper, and salt. Mix until well blended.
Pour the mixture into the prepared casserole dish and smooth the top with a spatula.
In a separate bowl, crush the Ritz crackers and drizzle the melted butter over them. Toss to coat.
Sprinkle the buttery cracker mixture evenly over the top of the chicken mixture.
Bake for about 30 minutes, or until the top is golden brown and the casserole is hot and bubbly.
Let it sit for a few minutes before serving.
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Notes
Store leftovers in an airtight container in the refrigerator for up to 3 days. You can also freeze the casserole before baking for up to 2 months.