Heat oven to 350°F. Spray 9x9 inch baking dish with non-stick cooking spray.
Prepare instant mashed potatoes as directed on package.
Stir in sour cream and 1 cup of the cheese until completely blended.
Spoon mixture into baking dish.
In a large mixing bowl, stir together chicken, BBQ sauce and ¼ cup of the green onions. Spoon chicken mixture over potatoes; top with bacon and remaining ½ cup cheese.
Bake for 20-25 minutes or until cheese is melted and edges are bubbly.
Top with remaining ¼ cup green onions as garnish and serve.
Notes
With this recipe we use a package of instant mashed potatoes, but if you are not a fan of instant mashed potatoes you can always switch them out for homemade ones! Use your own recipe, or this great homemade mashed potato recipe from Delish and you will have a great replacement for the instant mashed potatoes in our chicken dinner casserole. Recipe inspired and modified from Betty Crocker.