1. Preheat oven to 350 degrees F (175 degrees C). Prepare a casserole dish with cooking spray. 2. Bring a large pot of lightly salted water to a boil. Cook elbow macaroni in the boiling water until cooked through but firm to the bite, 8 minutes; drain. 3. Stir cooked elbow macaroni, cream of chicken soup, Cheddar cheese, tuna packed in water, milk, and butter together in a large bowl; pour into prepared baking dish. Sprinkle bread crumbs over macaroni mixture. 4. Bake in preheated oven until golden brown on top, 35 to 40 minutes. ---------------------------------------------------------------------------
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Ingredients