Preheat oven to 400F. Cook pasta to al dente according to package directions, drain and add into a bowl. Grease a 3 quart baking or casserole dish with nonstick cooking spray and set aside.
Add diced and precooked chicken, condensed soup, milk, spices, and frozen vegetables together in the mixing bowl with your cooked pasta and mix well. Spoon into prepared dish and spread evenly.
Mix together crackers and butter in a small dish and sprinkle on top of casserole. Bake at 400 degrees for 30 minutes or until edges are bubbly and top is golden browned.