Preheat oven to 400 degrees Fahrenheit
Combine noodles, tuna, green peas, onion, and mushrooms in a large mixing bowl. Mix well
Sprinkle salt, pour-in condensed cream of mushroom soup, and add 1 cup cheese.
Toss until all the ingredients are properly distributed.
Transfer the mixture to a baking dish and top with crushed french fried onions and remaining cheese.
Bake for 18 to 22 minutes.
Serve. Share and enjoy!