Prepare pasta according to package directions, adding broccoli florets during last 5 minutes of cooking; drain.
Preheat oven to 350º F.
In large bowl, combine cooked pasta, broccoli, cooked chicken, 3/4 cup Cheddar cheese, soup, milk, and mushrooms; mix well.
Spoon into a greased 13 x 9-inch baking dish. Top with remaining 3/4 cup cheese.
Bake, uncovered, 25 to 30 minutes or until hot and bubbly. Let stand 10 minutes.
Servings 0