Bring a large pot of salted water to a boil and cook the rigatoni pasta until al dente according to package instructions. Reserve 1/2 cup of pasta water before draining.
Season the chicken pieces with salt and black pepper.
Heat olive oil in a large skillet over medium-high heat. Add the chicken and cook until golden brown and fully cooked through. Remove the chicken from the skillet and set aside.
In the same skillet, melt the butter. Add the minced garlic and sauté for about 30 seconds until fragrant.
Pour in the chicken broth and stir to deglaze the pan. Let it simmer for 2 minutes.
Stir in the heavy cream and Italian seasoning. Simmer gently until slightly thickened.
Add the grated Parmesan cheese and stir until smooth and creamy.
Return the chicken to the skillet and add the cooked rigatoni pasta. Toss everything together until evenly coated.
If needed, add a splash of reserved pasta water to loosen the sauce.
Simmer for another minute, then garnish with fresh parsley and serve immediately.