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