Mix everything together in the pot that the spaghetti was cooked in. It works best to first blend together two cups of cheese, cream cheese, mushroom soup, chicken broth, diced tomatoes, onion powder, and garlic powder. Then stir in the chicken and spaghetti.
3 cups cooked chicken, 3 cups grated cheddar cheese, 4 ounces cream cheese, 2 (10.5 ounce cans) condensed cream of mushroom soup, 1 (10 ounce can) diced tomatoes with green chiles, 2 teaspoons onion powder, 2 teaspoons garlic powder