Boil a large pot of salted water and cook the penne pasta according to package instructions. Drain and set aside.
Heat olive oil in a large pan over medium heat. Add diced chicken, season with salt, pepper, and Italian seasoning, and cook until golden brown and fully cooked. Remove and set aside.
In the same pan, add minced garlic and sauté for about 30 seconds. Pour in heavy cream and chicken broth, stirring well. Simmer for 3-4 minutes, then add Parmesan cheese and red pepper flakes, stirring until the sauce thickens.
Add the cooked pasta and chicken back to the pan, tossing everything together until well coated. Stir in fresh parsley and cherry tomatoes, then serve hot!