Bring a large pot of salted water to a boil. Add the penne pasta and cook according to package instructions until al dente. Drain and set aside.

In a skillet, heat olive oil over medium heat. Add the sliced smoked sausage and cook until browned, about 5-7 minutes.

Add the bell peppers, zucchini, and garlic to the skillet. Sauté for another 5 minutes until the vegetables are tender.

Reduce the heat to low and stir in the heavy cream, Italian seasoning, salt, and black pepper. Cook for 2-3 minutes until the sauce is heated through.

Stir in the grated Parmesan cheese until melted and combined.

Add the cooked pasta to the skillet and toss to coat with the sauce and sausage mixture. Cook for an additional 2 minutes.

Serve hot, garnished with extra Parmesan cheese if desired.