rich & creamy tuna casserole

Ingredients

• 1 pound penne pasta, or pasta of choice
• 1 tablespoon butter
• 1/2 small onion, chopped
• 2 stalks celery, chopped
• 1 can solid white tuna in water, including liquid
• 1 can light tuna in oil, drained
• 2 cans cream of mushroom soup
• 1 cup evaporated milk
• 2-3 tablespoons sour cream
• 1 can mushroom slices, partially drained
• 1 tablespoon parsley flakes
• 1 1/2 cups cheddar cheese, shredded
• 1 cup italian seasoned bread crumbs, or 1 sleeve of ritz crackers, buttered & crushed