Cheater Mac and Cheese

Cook pasta in a pot of generously salted boiling water 2 minutes less than per package instructions.
Remove one cup pasta water and cook broccoli with pasta; drain:
Reserve 1 cup pasta water and cover to keep warm. Add broccoli to pot; continue boiling until pasta is al dente and broccoli is bright green, 1 to 2 minutes more. Drain.
Cook cream cheese, butter, and 2/3 cup pasta water in same pot:
Return pot to medium heat; add cream cheese, butter, and 2/3 cup reserved pasta water. Cook, stirring, until mixture is smooth and simmering.
Remove from heat; stir in pasta, broccoli, and Parmigiano-Reggiano. Toss with more pasta water as needed until sauce clings to pasta. Serve with more Parmigiano and black pepper.

Ingredient :

4 ounces short pasta, such as penne
Kosher salt and freshly ground black pepper (optional)
1 ½ cups fresh or frozen broccoli florets
2 ½ ounces cream cheese (⅓ cup)
1 tablespoon unsalted butter
½ ounce Parmigiano-Reggiano, finely grated (⅓ cup), plus more for serving