1.Cook spaghetti according to package directions; drain. In a small skillet, saute the onion, green pepper and celery in 2 tablespoons butter until tender. Transfer to a large bowl. Add the soup, mushrooms, pimientos, spaghetti, chicken and cheese; toss to coat.
2.Transfer to a greased 13-in. x 9-in. x 2-in. baking dish. Sprinkle with bread crumbs; dot with remaining butter. Bake, uncovered, at 350 degrees F for 30-35 minutes or until heated through.
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