Preheat oven to 350 degrees F. Spray a 9x13 baking dish with cooking spray. Set aside.
Boil water in a large soup pot. Once water is at a rapid bowl cook noodles according to package.
Drain and set in a large bowl.
Add tuna, cream of celery, cream of mushroom, milk, salt and pepper to a large mixing bowl.
Mix to combine all ingredients.
Add in the frozen vegetables, cooked noddles and mix together.
Pour mixture into the prepared casserole dish. Sprinkle crushed chips and french onions over the casserole mixture.
Bake 15-20 minutes or until chips/fried onions are crispy and starting to brown.