Preheat oven to 350°. Spray a 9 x 13 glass baking dish with cooking spray.

Boil noodles following directions on the bag. While noodles are boiling, dice celery and onion. Microwave celery and onion (covered) for 4 minutes. When noodles are done, drain in a colander.

In the pan that you boiled the noodles in, combine soup, milk, celery/onion mixture, pimentos, chicken and cheese. Stir all together and add drained noodles. Pour into baking dish.

Spread potato chip crumbs over the top. Bake at 350° for 45 minutes or until lightly browned.