Tuna tettrazini (of sorts)
This is another recipe that my kids just loved. Easy to make and filling also.
In a saucepan saute about 1/2 of an onion until tender. Sometimes I use dry onions and saute them instead. When tender, add 1 can cream of mushroom soup, about 1/2 can of water. I suppose you could also use milk, but I never have. Stir that and heat through. Then add about 3/4 cups of shredded cheese. I usually use Cheddar, but you can use other types too. They all give it a different flavor. Then add one can of drained tuna. Heat that through while you cook spaghetti noodles (1/2 package). When noodles are done, pour mixture over the spaghetti noodles and enjoy.
I have also been known to add musrooms to the mix when I want a little heartier sauce.