1. Boil water and cook macaroni until al dente.
2. While macaroni cooks:.
3. In large skillet, sautee onions and mushrooms in butter.
4. Add both cans of soup, bring to a simmer.
5. Add Cheese Powder from Mac-n-Cheese to skillet and mix well.
6. Add peas, drained tuna and milk until combined.
7. Drain macaroni and return to pot.
8. Add the contents of the skillet to the macaroni and mix well.
9. Add shredded cheese and mix until melted.
10. Pepper to taste.
11. Enjoy!