Start a large pot of water on the stove top over medium high heat. Cook the noodles according to package directions and do not let them cook any further, have the next steps ingredients ready.
Drain the noodles and put them back in the pan. Add the tuna, cream of mushroom soup, sour cream, onion powder, pepper and peas. Stir.
Spray a 9x13 pan with non-stick spray. Pour the noodle mixture into the pan and spread out. Sprinkle over the cheese. (Wait to add the French fried onions)
Place the casserole uncovered into the oven on the center rack. Cook for 25 minutes. Remove casserole from oven and sprinkle over the French fried onions. Place the casserole back in the oven and cook for 10 minutes more.
Serve and enjoy.
Nutritional values are approximate. Please use your own calculations if you require a special diet. Values below are for 1/10 of the recipe.