Instructions: Prepare the noodles in a large saucepan according to the package directions. Drain, return to the saucepan, and keep them warm. Heat oven to 375 F. Grease a 2 quart casserole. In a saucepan, over medium heat, melt the margarine; add the mushrooms, celery, and onion, cooking about 10 minutes, stirring occasionally, until tender. Stir in the flour until well blended. Gradually add the chicken broth and milk; bring to a boil, stirring constantly. Reduce the heat to low; cook about 5 minutes, stirring frequently, until the mixture is slightly thickened. Pour into the saucepan with the noodles; stir in the tuna, salt, and pepper.

Spoon the tuna mixture into the prepared casserole. In a small bowl, combine the potato chips, cheese, and bread crumbs. Sprinkle over the casserole, and bake for 25 minutes, or until hot and bubbly, and the top is golden.

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