TUNA CASSEROLE

4 cup butter or margarine 1 small red or green bell pepper, chopped 1 small onion, chopped 1 cup sliced fresh mushrooms 1/4 cup all-purpose flour 2 1/2 cups milk 2 cups (8 ounces) shredded Cheddar cheese 2 (9-ounce) cans solid white tuna in spring water, drained and flaked 1 (12-ounce) package egg noodles, cooked…

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