Preheat oven to 350, and spray dish with non-stick spray
Cook noodles 2 minutes less than recommended cook time. Drain and add butter. Stir and set aside.
In a bowl mix all ingredients. Adding 1 1/2 cups of cheese last.
Mix your tuna mixture and noodles together and transfer to casserole dish. Sprinkle the top with remaining cheese.
Place in the oven for 25-30 minutes. until edges are bubbling and cheese is melted.