Combine the pasta, tuna, soup, and half of the cheese. Transfer into a 9-inch-by-18-inch baking dish. Put the remaining cheese on top. Bake for 30 minutes at 350 degrees. During the last 5 minutes, add the French-fried onions. Let sit for 10 minutes before serving.
How much of each of these 3 ingredients would be needed to make: twice the amount of casserole?