Ingredients 
          
            - 3 cups medium noodles (4 oz.) 
 
            - 1 cup chopped celery 
 
            - 1/4 cup chopped onion 
 
            - 1/4 cup butter 
 
            - 1/4 cup all-purpose flour 
 
            - 2 to 3 Tbsp. Dijon-style mustard 
 
            - 2-1/4 cups milk 
 
            - 1 12-oz. can chunk tuna, drained 
 
            - 1/2 cup bottled roasted red sweet peppers, chopped 
 
            - Potato chips, optional
 
           
          Directions 
          
            -  Preheat oven to 375 degrees F. In large saucepan cook noodles according to package directions. Drain; return noodles to pan. 
 
            - For sauce, in medium saucepan cook celery and onion in hot butter until tender. Stir in flour, mustard, and 1/4 teaspoon black pepper. Add milk all at once; cook and stir until slightly thickened and bubbly, whisking to remove any lumps. 
 
            - Gently fold sauce, tuna, and peppers into noodles. Transfer to lightly greased 1-1/2-quart baking dish. Top with chips. Bake, uncovered, 30 to 35 minutes or until heated through. Let stand 5 minutes. Serves 4.
 
           
            
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