In small mixing bowl, toss 1 cup of the KELLOGG'S ALL-BRAN COMPLETE Wheat Flakes cereal with the melted BUTTER. Set aside for topping. Set aside 1/2 cup of the cheese.
Stir together remaining cereal, remaining cheese, tuna, soup, and milk in large mixing bowl. Stir in noodles, peas, celery, and pimiento. Spread in 10 x 6 x 2-inch (1 1/2-quart) glass baking dish. Sprinkle with cereal topping.
Bake at 350° F for 25 minutes. Top with reserved cheese. Bake about 5 minutes longer or until cheese melts and tuna mixture is thoroughly heated.