For me, I usually just kludge my tuna casserole together in a pinch, either adding a can of tuna and some peas to the last minutes of the boiling water, or the last 3 minutes of the microwave method, but if you want to try something a little more formal, here is a kraft dinner tuna casserole recipe.
1 pkg (227 g) Kraft Dinner Macaroni and Cheese
1 (10 oz/284 mL) can cream of mushroom soup
1 can drained tuna
1 cup frozen peas
1 Tbsp. Miracle Whip Dressing
PREPARE pasta as directed on package.
STIR in soup, tuna, peas and salad dressing. Spoon into a baking dish.
BAKE at 350°F (180°C) for 15 minutes.
recipe found at: http://www.kraftcanada.com/en/recipes/kraft-dinner-tuna-casserole-85472.aspx