Tuna Casserole

I made this a lot when my children were little. They loved it! Their father made it once and substituted corn for the peas.....he had a major rebellion! He couldn't understand it; they were both vegetables! I let him know that if the corn was on the side of the casserole, they would have eaten every bite. He never made tuna casserole again. 1 box mac and cheese cooked; 2c peas (we prefer frozen); 1 can cream of mushroom soup; cheddar cheese cubes (eyeball it); 1-2 cans drained tuna; mix well and bake 350 degrees for half an hour. I have a "no tuna" son, so it can be made without the tuna. He loves it that way!