Boil water for pasta in a large pot. Salt boiling water and cook pasta for 6 minutes. Add broccoli to the water with the pasta and continue to cook until pasta is done, about 2 more minutes. Pasta will be al dente, because it will keep cooking in the sauce.
While pasta is cooking, heat up chicken and mushrooms in microwave, if cold. Heat butter and milk in a 2½ or 3 quart saucepan. Once hot, add cheese packet and whisk until almost smooth, then add Parmesan and stir until melted together.
As soon as pasta is done cooking, drain it in a colander and shake vigorously to remove extra water; add drained pasta to cheese mixture in the saucepan, and mix well. Add chicken and mushrooms and toss to combine. Serve immediately.
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