Brown sausage in a skillet and drain excess grease.
Add uncooked pasta, sausage, zucchini, broth, cream cheese, and seasonings to a greased 9x13 baking dish. Stir everything together well.
Cover VERY tightly with foil. Double foil if needed.
Bake covered at 375°F for 50–60 minutes, stirring once if needed, until pasta is tender and most of the liquid is absorbed.
Top with pepper jack cheese and bake uncovered another 5–10 minutes until melty and bubbly.
Let sit a few minutes before serving so it thickens up!
