Cook the spaghetti, the peas and the hard boil eggs separately on the stove top. Shell the eggs and cut into little slices. Drain the peas and spaghetti and put in a casserole dish. Add the eggs.
Open the cans of Cream of Chicken soup mix with enough milk to make it creamy. Pour over mixture in the casserole dish. Add Tuna, drained. Mix with spoon well so that everything is covered with the soup. Add shredded cheddar cheese on top.
Cover and Microwave for 5 minutes on High. You can put in the oven if you don't want to microwave it. Heat it just long enough to melt cheese. Serve and enjoy!