preheat oven to 325°. Bring a large pot of cold water to a boil, season with 2 tablespoon salt and cook noodles according to package instructions. Drain and return to warm pot with butter. Add remaining ingredients and mix.
Spray a baking dish with nonstick spray and spread noodle mixture into pan evenly. Place pan into a larger pan filled with 1/2 inch of water, to create a water bath. Cook for 45 minutes.