Preheat your oven to 350°F (175°C).
Cook the penne pasta according to package instructions until al dente. Drain and set aside.
In a skillet over medium heat, add the olive oil. Once hot, add the diced chicken and season with salt and pepper. Cook until the chicken is no longer pink, about 5-7 minutes.
Add the minced garlic to the skillet with chicken, stirring for another minute until fragrant.
In a mixing bowl, combine the heavy cream, ½ cup of Parmesan cheese, mozzarella cheese, Italian seasoning, and a pinch of salt and pepper. Whisk until well combined.
In the baking dish, combine the cooked pasta, chicken and garlic mixture, and the cream and cheese mixture. Gently stir until the pasta and chicken are evenly coated with the sauce.
Top with the remaining ½ cup of Parmesan cheese.
Bake in the preheated oven for 25-30 minutes, or until the top is golden and bubbly.
Remove from the oven and let it cool for a few minutes before serving. Garnish with fresh parsley if desired.