Preheat oven to 350 degrees. Spray a 9 x 13 baking dish with non-stick cooking spray.
Place chopped cooked chicken into bottom of prepared baking dish evenly. Spread out frozen vegetables evenly across the chicken.
In a large mixing bowl whisk together cream of soups, 1/2 cup milk, sour cream, salt, pepper, garlic powder, onion powder, and paprika. Pour mixture all over the vegetables in casserole dish and smooth evenly.
In a ziploc bag crush ritz crackers into crumbs. Pour into a medium bowl. Add in melted butter and mix until crumbs are coated well with the butter. Sprinkle crumb mixture all over the casserole. Top with shredded cheese evenly across casserole.
Bake in preheated oven for 40 minutes until cheese is melted and casserole is heated through. Top with green onions as a garnish if you wish. Best served over cooked egg noodles, rice, or mashed potatoes. Enjoy.
